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~~
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
7 @# \0 E8 ^# r& F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
5 ~2 G& R; w1 E" F' u0 @9 y5 o$ x1 h3 O9 @0 l) S0 P从现在开始我乱花钱- z6 Q" A) E* j! D' R
. Q  Q  B; d4 C. w9 R, t+ B& Y. G. I+ H; D. N
' d9 }& V$ V) R- y) o  K呼呼
2 B+ U5 V& i9 I1 q6 M# u0 e  \) [4 b; F- H. s总有一天我成为负翁的

lijingwen1989

回复 1# william11211
9 ^, d# x: s* L% r6 o
' |0 S9 D* F6 k! F, X, \1 Q
9 B$ ~# k9 p8 I5 B    有意思！

lijingwen1989

回复 11# neilhua


    好厉害！

zhouhuanjia

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

ch71444

The centre of percussionCOP is not a unique point on
0 a7 F$ \, z- @! A( @( Uthe barrel since it is defined in terms of a conjugate point in
2,6,7
# l1 V5 H, Y& c8 E5 G3 @. P" h7 n( }the handle. Each point in the handle is associated with a
different 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.
+ ]0 Z5 |6 G0 i4 u) l1 |" hThe combined effects of translation and rotation result in a
3 v* d; A. b4 t/ jshift of the actual axis of rotation, away from the centre of
mass toward the handle. The axis passes through the conju-
gate point for that particular impact. If b is the distance from
the impact point to the centre of mass, and x is the distance
9 W5 \# q2 I& N# m4 G1 |: R% S# Efrom the centre of mass to the conjugate point, then xIcm/(Mb) where Icm is the moment of inertiaof the bat
$ A/ ?4 h+ M- q& cabout its centre of mass and M is the mass of the bat. Con-
% d+ b- e+ W" H* k1 zsequently, if the bat is pivoted about an axis through the
conjugate point, and if the ball strikes the corresponding
, [4 Y* j5 O9 e, \5 R' ~. UCOP, then there is no reaction force at the pivot point. It is
therefore reasonable to expect that every point under the
$ N" w, ]% {; I  G& bhands will have its own COP and that an impact at any given
COP will generate zero reaction force at the corresponding
8
5 i9 U" B; D5 q# A0 sconjugate point under the hands. Brancazio has suggested
that the sweet spot zone might therefore encompass all cor-
responding COP points along the barrel. There is, however,
% k+ c- d% ?; ]% Yan uncertainty in this argument since a hand-held bat is not
" m0 H3 j5 Z. n; d  D2 Efreely suspended, nor is it pivoted about a single axis, and
% Y1 v5 M( ]+ \7 C6 Ymay behave differently as a result of the reaction forces ex-
4 o' X6 d' W, k, s) ~+ J9 }$ t) \erted by the two hands. Furthermore, the axis of rotation may
$ _$ d5 }4 ?& i1 l1 R3 Reven shift as a function of time since the ball remains in
contact with the bat for about 1.5 ms, the transmission time
5 T( h' J& ]; q, ?" j' C  Y& Rof 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
" X5 W& ]& X( D% _  J$ G  \) kthe bat.

ch71444

呵呵，好的~~~~~~~~~~~~~~~~~~~~~~~~