开关在运行中遇到哪些情况时应查明原因或停电处理？

Two years ago I broke my arm ____ football.

A．when playing

B．while played

C．played

D．having played

Which of the following statements best describes humor in China

A．It is more or less the same in all parts of the country.

B．It is drastically different in every part of the country.

C．It is distinguished from Hong Kong.

D．It is more a verbal act than a physical act in the north.

以下哪一项不是营养支持的目的（）。

A.维持机体的组成以及生理功能

B.帮助患者安全度过治疗阶段

C.减少或避免由于治疗引起的不良反应

D.维持患者良好的生活质量

E.达到治愈肿瘤的目的

一水池装有甲、乙、丙三根水管，甲、乙是进水管，丙是排水管，甲独开需10小时注满，乙独开需（小时注满，丙独开15小时放完水，现在三管齐开，（）小时才注满水池。

A．5

B．6

C．5.5

D．4.5

Intel在以下哪种CPU首次采用了倍频技术和高速缓存技术（）

A.80386

B.Pentium

C.80486

D.Pentium pro