为什么越花钱的人越有钱？越不舍花钱的人越穷

neilhua

有意思。没办法~~有意思。没办法~~
) Q8 b, m% e5 X% {6 L6 [有意思。没办法~~有意思。没办法~~

funny_lp

还好还好还好还好还好还好哈 $ J6 q& Z, K% ]; j  j3 L- e
2 o- s. y$ L' O! G8 {. v6 j7 q; `啦啦啦啦

ml0872570

这到底是反映什么的？？？~~~~~~~~

cpp0325

跟MCM有什么关系吗?????????????????

cyj66

太好了
1 h3 O9 @0 l) S0 P从现在开始我乱花钱- z6 Q" A) E* j! D' R
. w9 R, t+ B& Y. G. I+ H; D. N
呼呼
! u" ^  W$ L! v( c6 M# u0 e  \) [4 b; F- H. s总有一天我成为负翁的

lijingwen1989

回复 1# william11211


- P& h; c' ^( y    有意思！

lijingwen1989

回复 11# neilhua
" w6 ]+ _5 Y! T1 O& u
+ t* q' N8 X; m! S) v
! Z3 I' ?- @( I$ B. D8 @    好厉害！

zhouhuanjia

hehe~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

ch71444

The centre of percussionCOP is not a unique point on
the barrel since it is defined in terms of a conjugate point in
2,6,7
8 s0 a2 Y; L$ z8 \the handle. Each point in the handle is associated with a
1 j. Z6 A( E4 T0 Bdifferent COP in the barrel. When a ball strikes a freely
suspended bat, the bat will translate in the direction of the
incident ball and it will also rotate about the centre of mass.
8 r9 x1 j0 f! ?3 LThe combined effects of translation and rotation result in a
shift of the actual axis of rotation, away from the centre of
mass toward the handle. The axis passes through the conju-
; N4 P- H! v9 [. q/ U9 a) Ggate point for that particular impact. If b is the distance from
the impact point to the centre of mass, and x is the distance
from the centre of mass to the conjugate point, then xIcm/(Mb) where Icm is the moment of inertiaof the bat
2 w! V' v+ ~! s4 x" ~2 \( `, d& K4 q. [about its centre of mass and M is the mass of the bat. Con-
" T) I8 B2 G2 }& Ssequently, if the bat is pivoted about an axis through the
% T8 O' V+ a  j( C: X0 Y3 d' u' tconjugate point, and if the ball strikes the corresponding
4 g6 H) |, E* BCOP, then there is no reaction force at the pivot point. It is
8 k1 f5 K9 ]3 t; R( }0 z" `therefore reasonable to expect that every point under the
hands will have its own COP and that an impact at any given
3 G# m7 \$ v& |- eCOP will generate zero reaction force at the corresponding
8
conjugate point under the hands. Brancazio has suggested
that the sweet spot zone might therefore encompass all cor-
3 f5 W4 X$ {* t( u. ]responding COP points along the barrel. There is, however,
an uncertainty in this argument since a hand-held bat is not
" I% @. V  T) E( q$ nfreely suspended, nor is it pivoted about a single axis, and
8 {7 c9 }6 _. R4 Y& `; I0 Vmay behave differently as a result of the reaction forces ex-
! w" {# m- E" n5 }8 y, l; V: Verted by the two hands. Furthermore, the axis of rotation may
* b* I1 B/ i" S- t/ aeven shift as a function of time since the ball remains in
% U! z, q8 v9 O# l4 econtact with the bat for about 1.5 ms, the transmission time
of the pulse from the impact point to the hands is about 1 ms,
and the impact forces on the hands last for about 20 ms as a
result of the induced vibrations and the induced motion of
+ B1 }- m0 p& G+ r8 g  Nthe bat.

ch71444

呵呵，好的~~~~~~~~~~~~~~~~~~~~~~~~