圆形光滑轨道位于竖直平面内，其半径为R，质量为m的金属小球环套在轨道上，并能自由

短文缺词填空，每空一词。（每小题1分，共10分）

I’d like to tell you about Halloween. People in the USA c   小题1:    it on the evening of October 31st. On that day, children like to p  小题2: a game called “trick or   小题3:  ”. They knock on p  小题4:doors and shout “trick or treat”. If people don’t give them a  小题5: candies, they can play a trick o 小题6: them.  Usually they w 小题7: masks or paint their faces. People don’t know who they are. Another i 小题8: thing is to make pumpkin lanterns. On the evening of that day, families always have a s 小题9:  party. People can e  小题10: hot drinks and lots of nice hot food. It’s really wonderful.

以下有关肾结核的描述，错误的是（）

A.一侧性病变多见，少数为双侧性

B.基本病理改变是结核性肉芽肿伴干酪样坏死

C.超声显像是肾结核的早期诊断最敏感的检查手段

D.声像图表现具有复杂性和多样性的特点

E.肾结核的诊断应注意与肾肿瘤、肾积水等多种疾病进行鉴别

体温调节的基本中枢位于

A．中脑

B．脑桥

C．延髓

D．小脑

E．下丘脑

差异化战略的职能结构主要重视财务和研发两个职能。

在制冷系统中，除压缩机外都属于其他设备，统称（）设备。

A.主要

B.次要

C.辅助

D.安全