联合库存管理的优点是( )。A．减少了供应链中的需求放大现象 B．获得一流的物流咨

腔肠动物的特点是：食物从口进入消化腔，消化后的食物残渣从肛门排出体处．______．

B

She went back to China to study journalism at Peking University. She is also 45 ________________ a sports program about the 2008 Beijing Olympics. She even hopes to 46 _______________ table tennis in the special 47 _______________ for disabled people in 2008 .She tells people that she likes to think about positive things and stay optimistic. She believes that keeping busy helps her to stay 48 _______________.

用数字2、5、0、9组成最大的四位数是______，最小的四位数是______，它们相差______．

(12分)如图所示，质量m=2kg的物体静止于水平地面的A处，A、B 间距L=20m。用大小为30N、沿水平方向的外力拉此物体，经t₀=2s拉至 B处。(已知cos37°=0.8，sin37°=0.6，取g=10m/s²)

⑴求物体与地面间的动摩擦因数μ；

⑵用大小为30N，与水平方向成37°的力斜向下推此物体，使物体从A处由静止开始运动到达B处，求物体的运动时间。

应诊断为

A．臀部疖

B．臀部肌肉损伤

C．臀部结核

D．臀部脓肿

E．血肿机化