Males

对包围圈日军歼灭战的第一轮进攻7 Q9 k* p. L" X( x8 Q
+ g% r+ w# E- v! G- ^
第一天+ a* y: L2 q, R4 G& d$ n
Ground combat at 43,31& n& o3 X( s9 b$ S
. i& u# ?. j, M1 R! c- v3 D
Allied Shock attack; y5 k6 K9 ?" P- {* p

7 j# o8 W& Q. t. D4 kAttacking force 124697 troops, 947 guns, 73 vehicles, Assault Value = 3721' z& u3 W. S; l. j. p) p
7 `& S  H# R& N( `& `
Defending force 65728 troops, 744 guns, 9 vehicles, Assault Value = 13095 Y6 g* z+ V0 D. U4 d% [
, m7 \8 r# j: Z  g
Allied max assault: 7164 - adjusted assault: 4011 , p1 g- o8 k. z  Z; T

8 H: C" ^( X2 F+ qJapanese max defense: 1346 - adjusted defense: 855
. z  I1 H, @; f3 o/ n0 x& c6 e# }
" M8 F8 G" `7 eAllied assault odds: 4 to 1 $ f2 J6 X4 F9 K% \) u
& P: z) B- K* A7 ^# {& ?- m$ c
Japanese ground losses:& {' ]3 g& o3 t# Q* O
477 casualties reported
3 i$ R  I. q5 G3 P* [' K9 S% x0 F, HGuns lost 13
! K! r/ F" l# {( E4 O
4 ]* m' x) e: xAllied ground losses:
. s# a+ g$ G# y; J5 i! j: `" l2700 casualties reported9 P2 q: X7 G5 i, E- q3 W0 y
Guns lost 93( R, f4 G- C+ w$ h0 V6 q6 }
Vehicles lost 25 i( V+ t/ m1 l, y; t$ @
7 M3 j, i, J4 v: |( i) ?
第二天
0 m: @0 s$ k% O6 [& @* `+ P) a3 SGround combat at 43,31
7 x5 o. r6 F' h) a) O2 M
; R. U2 f. Q$ H- J6 RAllied Deliberate attack; Z" \/ j( w* T7 p" b' n7 ]/ r

: T  b6 Y" w5 k1 X* D5 ?, G0 G! kAttacking force 120723 troops, 822 guns, 71 vehicles, Assault Value = 3403
& c; N( e* E  t, s3 T: x0 i3 Q) J& z" \2 M1 s+ h; A$ w
Defending force 64593 troops, 726 guns, 9 vehicles, Assault Value = 13013 r" \$ ?, R% |6 q% G- T0 @
  f$ U0 v, R  |  y9 k
Allied max assault: 3071 - adjusted assault: 1149 ' f. G+ O0 g: ?- l. B9 Q
! b+ i7 `- d  X% q
Japanese max defense: 1333 - adjusted defense: 549
& O7 T* F- P7 e5 c, _: N5 Q+ d; Z1 o7 x4 Y6 W3 q. i
Allied assault odds: 2 to 1
& H9 P! o, x: V4 a2 {
6 T2 ?2 w7 A" \! t  z3 f- U6 A+ r1 v: W
Japanese ground losses:/ B/ ]$ r/ o: d
449 casualties reported0 U+ A2 m* e# d' z
Guns lost 14
  a' k. Q* R" N2 q2 E
6 l/ r( D0 X# U9 I( v8 h9 HAllied ground losses:
9 j) p' j/ D+ a: U9 y1407 casualties reported
, N6 k6 S. b/ w3 R  h8 a8 s! t+ ?Guns lost 46
  Q0 M7 N0 ?. p. J: g
% N$ c& G! {9 A8 O; _第三天
5 R( G7 l" ~+ BGround combat at 43,31
( g( ]& G% d; t  i' m% l# z
; z9 Z+ N6 M& g$ GAllied Deliberate attack
7 n% z1 P/ s9 a2 K0 b" e$ j, H6 [8 g) ]1 t* |
Attacking force 118451 troops, 751 guns, 70 vehicles, Assault Value = 3238
& P9 S* l% U& c  _7 D1 |- k: w5 T$ B
Defending force 62973 troops, 703 guns, 9 vehicles, Assault Value = 1294
/ Z, u8 k8 J+ o* S- L8 e4 D0 u6 j, \+ }+ f0 G
Allied max assault: 2870 - adjusted assault: 779
7 v/ p' F8 [  J3 ?
$ Z3 U6 Z9 g; X0 j  x6 eJapanese max defense: 1305 - adjusted defense: 488 7 b5 j& ]6 }% y+ E1 m* T, ?
" A# s1 O! N% y! E8 D- M; C
Allied assault odds: 1 to 1
0 G$ m# d6 [4 X8 L, B( u* b" o4 |
% t; p7 \* t5 }: e7 j) G! v3 A; J: vJapanese ground losses:! D* g$ S3 N- @5 V" n
682 casualties reported
- ?' ~9 [/ L' b# y  l: R1 CGuns lost 30, _( N5 @' d/ B, `7 [
Vehicles lost 1
8 F8 H! X( V8 s9 x! m4 y4 Z% i2 S
" w* ?/ r# t0 p. C( IAllied ground losses:  }1 V" Z6 {* f6 T% b
1585 casualties reported
! S- j6 i1 L7 _Guns lost 60
6 I# p, z0 q+ P/ W: {+ aVehicles lost 22 Q2 h, F' k9 Y# N2 d

& P" F& T: `5 M4 k* y$ ?& v第四天
+ r( a; K8 j; v3 p! a* S3 NGround combat at 43,31; u# u0 U; N" u) D5 W; f- V, A9 B
- I5 G- e. E5 d$ i  e) b. W
Allied Shock attack4 y* y9 W, q' w% c; [. O# h
& u7 u9 y6 C1 f# j$ B8 J
Attacking force 116057 troops, 670 guns, 68 vehicles, Assault Value = 3050( c: h3 k& J! Q/ g0 N' x8 @

/ W4 {3 X6 l  ^' _7 I8 `- l( Z0 r5 }Defending force 61583 troops, 664 guns, 8 vehicles, Assault Value = 1273$ u* O0 J. g5 ~  ^3 e
3 |! _6 O5 d1 ~$ v! t6 m
Allied max assault: 5430 - adjusted assault: 1028 4 E: V8 U9 A7 {4 \. ]

2 s2 Z# j  i$ OJapanese max defense: 1235 - adjusted defense: 644
5 w: Q9 J1 u+ R7 u$ [% B  O$ B0 f& U9 A: H; m! k$ l
Allied assault odds: 1 to 1
% ]' A- t: v0 B! O' n! P3 J3 M  F! M8 V% J* U) b! D
0 \0 ?9 \! t2 f, H' w5 r  {" L* @
Japanese ground losses:' \+ s2 x! o4 h' L* z) B: y3 }
691 casualties reported
1 W- Y% k4 }7 A8 G( V6 {; [Guns lost 8( @2 F! j! o1 L. J

, s: Y0 x1 L: ZAllied ground losses:! O2 v) Q9 ]. L- M5 X: [1 d- ~
2252 casualties reported! ~* S+ `& l- x  j: ?- W
Guns lost 67
: H- }* P1 @; Z6 d6 gVehicles lost 4" ?" ~8 X$ A  b- G+ N( H0 a

% j0 K5 ], |  l+ z. M- d3 i3 a/ Z
0 h6 C0 j( S5 L& V日军减员4000余人，国军减员10000余人，但国军是可以恢复的
+ W- B# Q) z8 w/ H9 \' ?# S: Z1 s1 Z& w# X2 t

# o4 X) A3 h, n( }( ~随后两天国军进行休整' Y2 k2 M9 q& D2 r. R& I

' X# ~; g2 d5 X, `) E5 o! P- R% b
# U9 e: v- l- \0 \( W& |% Y6 ?第五次进攻) S3 r2 `& |4 n, ~4 u- B0 q

: h* H& i9 C  t" {5 A: OGround combat at 43,31( y, b: V; c( G: |2 W* C' q

$ w; b, A& r- `9 i/ c" w# `Allied Shock attack
4 n% i0 X4 W2 i! t* Z4 Y4 j4 Y
6 r6 n! h; ]# @3 LAttacking force 112498 troops, 607 guns, 69 vehicles, Assault Value = 27101 q7 ]- c9 z0 ~( w: y
3 b3 U! y$ H; S
Defending force 60376 troops, 651 guns, 7 vehicles, Assault Value = 1263
6 ~$ C! `9 f6 u& }. g$ X* U1 R( F8 O7 ?
Allied max assault: 5168 - adjusted assault: 2095 ! e$ R; s" j3 K5 U' R0 v8 A2 ~

3 j9 g: F5 p1 xJapanese max defense: 1275 - adjusted defense: 469 ; r# J9 X5 W) f

8 Z+ o& L4 y- A  d! ^Allied assault odds: 4 to 1 1 |/ K. m3 N7 S: e
" U" |' T% j$ M# h
+ d9 a5 m( J3 E0 v5 H+ {7 z
Japanese ground losses:
" q7 [' x+ ?* _' A: I' l$ h1123 casualties reported  ]3 L! I; C/ H, z3 r3 ]- p
Guns lost 8
; {, L5 U" c4 u, T: M6 l! X! V$ ?
  ~+ y" P( R* z# PAllied ground losses:
. e' j! S  M6 Q2 R) r3 T) a2701 casualties reported
6 Y7 H( v# R; }Guns lost 67( B% @9 p& L1 P2 Z& p& o# P0 E1 E
Vehicles lost 8
, V3 f/ ]3 n/ k' N* A$ c$ l 9 D1 D' a  O5 y3 ^
每次进攻 日军减员在1000-2000人之间，后期应该越推越快，按照打一天休息一天算，这批日军至少要3个月以上才能歼灭 9 P3 @. v2 F8 A2 Y* O$ k# Q8 o: ]

, M  a; G/ N# b' w. E& i[ 本帖最后由 Males 于 2008-7-1 23:52 编辑 ]

dilliulian

没有个半年根本啃不动的,你长沙早就失守啦

dilliulian

AFTER ACTION REPORTS FOR 03/22/42
" L( ]4 [" B7 w& b--------------------------------------------------------------------------------
! [( ]- H, W4 J& ]  ENaval bombardment of Karachi, at 21,3: J0 B* S. c( Y4 R, n, ~! q) m

1 u2 o% T; o% |Japanese Ships
: ]6 y/ H+ k# Z7 O6 E# z/ P( eCA Mikuma- k5 z4 C; g" i" Z: f7 n6 R
CA Mogami! D+ V/ E& @" R7 T9 w/ x& N
CA Nachi- I% D) X. W0 j4 ]" _2 V4 M
CA Haguro
, T2 P7 W5 }# D* D5 f3 b0 ~3 n7 @/ ICA Myoko
2 I% Y0 u7 O, U# f) e, u& S% ^, KCA Maya
. B4 F) {3 V2 T2 D# ECA Atago4 [! _9 K; z; f2 l) e. q! C
BB Hyuga
1 I4 k6 a8 K; k$ b+ zBB Mutsu/ N) K1 E" ~  P+ T( u
BB Nagato! o, j: ^1 R" A+ Y( [9 p( K
BB Kirishima- W6 d$ I: m6 ^4 S, c; c$ Z; X
BB Hiei( K3 I* ^9 z& T8 T4 W, a4 `
' E" X( k5 u* V; b

  W; C9 H9 p. s5 hAllied ground losses:. o+ O. T$ P& o8 `% r9 t$ P
657 casualties reported& }; T. P3 i( g3 b* q' h$ n$ U
Guns lost 29 f, e. V! i7 r5 W. W2 M
Vehicles lost 3
+ I" r8 r$ e! T# d0 H& D2 e* J
( V# ]& g6 J0 ~& ZAirbase hits 3, h# N$ ?9 y, |2 X0 E' s, P
Airbase supply hits 4
- @* B5 N! h$ g. y3 n3 L% s: d" ARunway hits 52, S0 g7 D* [! k1 E$ A# z
Port hits 7) u* B! n3 ^5 D' A! W6 D
Port fuel hits 6, P0 }: w3 R% @( J9 i
Port supply hits 5/ m) Z8 \0 q0 [& M9 z- k) U

5 H! Z8 D8 s$ ~& E* T! Y--------------------------------------------------------------------------------
( s7 i0 d: @3 I8 FNaval bombardment of Karachi, at 21,3# w3 s: k4 V) d. k  ?
& h% z2 h( }5 J0 K, `' F: Q
Japanese Ships
% O5 i# {  a$ q. d+ YCA Chokai
) }: f. }( f+ ~8 D5 |, m: {) BCA Takao) r6 N4 E9 u( Z" `
BB Yamashiro. f% }, l  W5 c( |6 Q% ]
BB Fuso
2 ~. H# u, G& nBB Haruna
( G& i* P# ^1 @3 QBB Kongo1 t. k- w0 ?6 }& W' n4 F
, i$ N0 Y5 ^1 p
; f% [2 Z, x/ ]- W
Allied ground losses:8 Z' e4 h1 s# ?0 b6 J1 d
123 casualties reported; P  s$ m+ t, w0 w0 a$ ?, O
9 M9 ?; q: h7 m7 G
Airbase hits 1
6 A5 T1 l2 l$ ~Runway hits 39
7 N, s' r5 |0 |7 O& d3 U% o! yPort hits 5# u6 d! H$ [8 n% H
Port supply hits 8$ Y! U* t- S! l* R4 f6 t
--------------------------------------------------------------------------------
, N+ R1 d1 U% D9 L* d  t+ SGround combat at Karachi0 D! C4 |1 P% @& l

& ]$ U( z3 U( U0 ?  N2 d1 v3 W, W2 hJapanese Shock attack
5 Z/ e/ ?0 E1 y/ K: \! b
1 `" W& f0 Y6 o, A* F6 J- vAttacking force 173921 troops, 1762 guns, 24 vehicles, Assault Value = 3011. w; F/ _/ `. a4 ~& j3 |* y
+ d0 y- W& _4 _' h
Defending force 26146 troops, 196 guns, 0 vehicles, Assault Value = 600  _  \* O- Q1 r4 Q  R# z% `& H9 B; O

. e0 ?8 e% D6 w  `0 cJapanese engineers reduce fortifications to 1$ j' v* A4 ?5 N# D! ?

, w5 y' r: c4 Q! E) y  IJapanese max assault: 5792 - adjusted assault: 4334
  {5 I. x5 D/ y  B 4 Z1 B( z6 d$ a
Allied max defense: 345 - adjusted defense: 705
# i2 r+ D/ U/ E 8 w! R7 k% H' `& y4 g
Japanese assault odds: 6 to 1 (fort level 1)
+ r4 B+ y$ v+ |$ x7 A( n
3 j; Z8 M8 u  e5 t$ R% nJapanese forces CAPTURE Karachi base !!!! O/ [# J( ]8 J' o7 F

2 n  `- S  U  {
) I  o6 S  [  m) O  h: G
3 l: H2 y. L% I' r4 m6 F- pAllied aircraft$ {+ i7 y! Q2 I. L1 b
no flights
& ]  s& V/ m1 m8 k, G
) U* O9 @4 E2 h2 e0 `
: N# Q- B* B0 W: a+ HAllied aircraft losses
2 L( l6 \6 x( c- _0 kCatalina I: 1 destroyed
3 q! g6 x. s) S6 n6 {Hurricane II: 1 destroyed
) e9 r) f  ?, n, |' S
: b) u5 }& j8 B9 r, c$ P% m+ SJapanese ground losses:
5 J) G2 n0 M+ O' }# w2074 casualties reported
  _% V9 V) [: {  a& T/ ]* AGuns lost 32
  s% Z* \- A1 F  o" n) I7 fVehicles lost 14 B+ H0 @3 G' S2 B+ o
  B/ S. P& Y1 M6 c
Allied ground losses:2 b$ z) Y( s3 `7 K  P4 n
38828 casualties reported/ Q' z' \% X& S6 }
Guns lost 2985 v% I! N7 y0 ]9 [

9 N; X: }9 ?% N& ~# N4 @- w英第2,第18师也被从战斗序列中删除了, R0 f$ g! P! L1 K( i& q
帝国位于德里的多只坦克连队还是抵挡不住英军坦克旅的进攻被迫撤退
* f5 r4 C- e! b( i. R; O& ~: u" j--------------------------------------------------------------------------------
& ^! w) o4 p2 x( m" h+ p0 N8 F0 BGround combat at Delhi
6 ]& K& T* `* }5 C, E! d+ L
( G5 {. n* m5 eAllied Shock attack! k4 l5 g0 \1 i" t& z

2 l$ D: K$ w' Z! Z: o( a; {7 sAttacking force 52548 troops, 600 guns, 713 vehicles, Assault Value = 727
+ S& J; E; h$ U" ]% s
% d& {5 y/ B% N. w  GDefending force 7584 troops, 63 guns, 377 vehicles, Assault Value = 236! C0 u0 h0 u# j

6 n/ [$ @! n- i% @/ Y" sAllied max assault: 1462 - adjusted assault: 1452
( D1 S: h8 E- ?; q' w. k8 M2 j/ _" i 2 f1 A1 O+ o6 Y
Japanese max defense: 236 - adjusted defense: 389
1 ~5 @% f0 C% r/ f- T5 Z) ]
7 R+ D$ f. B0 F8 q5 T9 Q3 Y5 ]Allied assault odds: 3 to 1
, ^) F2 h& C6 Y- c8 v+ v . s. i( E0 _' d/ N& Z

+ ]) o% ~2 q6 V6 J6 B" O+ ^Japanese ground losses:5 U, H9 b8 f$ ]; K. r7 x; P
697 casualties reported/ ]8 s9 g2 A, H, M* z- M7 A
Guns lost 14
* ~/ }) v$ e* Z" g/ [9 o; L5 HVehicles lost 31
. J) I4 |* [3 g% [5 D' m
/ j  [% T/ \- Y# q4 C2 `Allied ground losses:7 V8 p9 ~% r9 e. w7 Z5 {
1100 casualties reported
; _/ M7 o) S+ O/ S, P7 tGuns lost 47
0 ?& E) N% }8 V! t8 O- P' YVehicles lost 6
! {9 t5 }! V2 E1 `$ w% N 1 O1 P$ B  \& M. Y

: g4 d  i/ b7 f4 n/ m$ ~Defeated Japanese Units Retreating!$ L" V1 }5 G8 n

+ p6 t& U, f1 U  {& {在长沙的帝国炮兵部队展现出惊人的杀伤力,每天都击杀国军近千人,比被包围的日军先头部队的伤亡还厉害
+ j' ?0 ~) W/ q  F2 X# }--------------------------------------------------------------------------------
7 x3 l" c2 v* vGround combat at Changsha' E' h. p1 k) e4 D, `

/ F/ y# T! c1 Y: J* C/ _# S  cJapanese Bombardment attack
$ V1 a; E  _3 K& m5 ^( `4 g
$ [! \! u: u, n! U6 `/ d+ v$ jAttacking force 65498 troops, 909 guns, 7 vehicles, Assault Value = 26208 K0 X+ Q% {" ?5 E# ]- f: N2 z7 o2 U
7 x$ B: X5 k3 H6 I
Defending force 76972 troops, 458 guns, 0 vehicles, Assault Value = 1866
& D% Q$ F4 H1 L$ {% [# p* P8 r # Z/ K# F2 k/ Z3 z
/ v$ N" I* _9 p6 u* @  {* b
" {' Q- h; J2 t
Allied ground losses:
" _5 c3 L  ^; p' Q( D3 b  ~741 casualties reported7 q: _' x$ N! v; H: M) D* u+ y+ w! c
Guns lost 5

dilliulian

之后南方军的后续部队将投入对华支援做战,现在长沙的守军明显力量不足,帝国将尽快攻克,之后再北上救援被围之部队

matie1977

从印度跑到中国，远了点吧。不如就近找关东军帮忙了

kevin_hx

卡拉奇都下了

Males

有空军和海军支援，早晚是要下的......

dilliulian

--------------------------------------------------------------------------------, [! ~1 r. [7 E5 i- `
Ground combat at Diamond Harbor
& Y( o7 S) X1 ?, i
& s1 |* G  P9 g' O- l4 I; L, HJapanese Shock attack
+ z0 m( J, c$ d # s) i, Q- `& w2 n: U
Attacking force 2413 troops, 26 guns, 0 vehicles, Assault Value = 68
% x* D/ T( I4 T# ]& j" r
' P; Q& s3 d: s) KDefending force 2330 troops, 38 guns, 4 vehicles, Assault Value = 1; S6 b! \3 Q  ^5 T" Q  O7 m% X

! {6 u. A3 i- Q2 }2 c' eJapanese max assault: 114 - adjusted assault: 69
/ W! N9 D* P/ J9 t+ Z, `4 U
5 k1 n! V# B+ G4 [Allied max defense: 1 - adjusted defense: 12
. ~; X2 F3 z0 ]3 {& H* Q
0 K" q5 s$ c7 {3 KAFTER ACTION REPORTS FOR 03/28/42
1 m/ T) L: B: DJapanese assault odds: 5 to 1 (fort level 2)
+ d+ a- h! G/ t0 L9 D; m  U
3 l5 x/ |2 e( `: E1 F5 ]1 e2 z$ {0 m/ JJapanese forces CAPTURE Diamond Harbor base !!!+ X5 K2 x: Y! b# w6 Q

4 X$ G. ]0 u+ H& N4 N# w 4 D' O$ Y5 e. I* M" S' N4 v8 N+ m
Japanese ground losses:0 @* ^. Q7 A0 o$ N8 a
171 casualties reported
1 T+ O' R7 j) O- ~9 j0 f2 \Guns lost 5' ~! m4 t4 d# }7 L% J4 A2 f

& s# X7 z* m% i6 wAllied ground losses:
) G& m, i; X" m- S6 L% Z1915 casualties reported; R+ M4 S7 g2 q- _, i- Z8 \
Guns lost 179 z; M& Q! p0 i2 x
Vehicles lost 1! X8 e4 |- g7 ^" g2 u
5 L# `9 n- N$ c5 z
帝国的炮兵还是很生猛的啊,每天的炮击都有600以上的伤害
3 W$ r: {/ Q0 s' _& ?$ N7 o8 D0 S. A' y- k
--------------------------------------------------------------------------------
/ t& g2 z1 N5 \7 ?" E' n" z: `4 DGround combat at Balikpapan
; B! v! W; k% E' o& V( | 0 e2 A6 _% Q5 p9 h; W% B
Japanese Shock attack/ s# z& V- D+ D
. u) t0 w2 ?& ]) W
Attacking force 31885 troops, 238 guns, 8 vehicles, Assault Value = 5455 T, N5 H4 o' K; ~4 j
% S% s) D6 E+ ^3 e8 v% J1 R
Defending force 9720 troops, 69 guns, 12 vehicles, Assault Value = 87, E: P- F5 O2 M: j, g5 t8 o

, l% J  Y/ a1 V9 I2 @Japanese max assault: 1036 - adjusted assault: 821
) m" h2 Q- v0 \4 }( Y7 E ' J% C; V  B& @, [. P
Allied max defense: 73 - adjusted defense: 73
* |3 F2 I% g6 c! d( X: y
: a$ v( z0 ~( j0 |  |5 ^Japanese assault odds: 11 to 1 (fort level 2)
9 _1 |- o7 ?* E: l% ?. d: h. ]* e ) Y3 T& U; ^. y) Y; j5 V- V- ]3 ?9 R
Japanese forces CAPTURE Balikpapan base !!!
5 h5 X& s9 J& A8 G 9 ?4 _7 S( G5 V; ?& {" L' H

9 q) K2 M0 l! K& k* f& \* N& c% ^Japanese ground losses:
6 Y$ e2 {7 g; w5 g  W% @' K807 casualties reported$ ^  j+ H" u2 w. f* y/ j
Guns lost 15
, K! \. O+ W5 j8 IVehicles lost 1
: V$ u( L: r5 V3 X $ \9 n" Y2 x3 ^5 y6 b
Allied ground losses:
1 Y# Y! t& E7 {# H451 casualties reported5 l( [8 c0 Q, W
Guns lost 8
, C5 [9 B/ {; A8 H8 s9 k
$ }/ b+ `- r0 [7 `/ J5 B
, e  l9 M& c+ D4 P. V( N, `Defeated Allied Units Retreating!

dilliulian

经过连续作战,帝国的中国派遣军终于打通了大陆交通线

dilliulian

将近9万多国军将士投降,多个番号又一次的取消

dilliulian

战斗部队番号

dilliulian

还有两个战区司令部

dilliulian

在长沙被我派遣军包围的半个月中,帝国的空军精英在长沙上空经过的C-47有将近百架,估计米军的库存也没有了

dilliulian

在印度次大陆上,南方军从LUCKNOW ,DAIMOND两头并进,孟加拉指日可下

chars

盟军统帅舍本逐末，这下亚洲大陆全线崩盘，还是经营好澳新的防御为上