（8分）人造地球卫星在距地球表面高度等于地球半径3倍处做匀速圆周运动。已知地球半

某施工队在200个工日内完成了800立方米的工程，但有400立方米不符合质量要求。

根据所学知识，回答问题。

上述施工队的时间定额为()。

A.0.25工日/立方米

B.0.5工日/立方米

C.2工日/立方米

D.4工日/立方米

.The Olympic Games, ____in  BC ,did not include women players until .

A．first playing

B．to be first played

C．first played

D．to be first playing

-I called you yesterday evening, but there was no answer.

-Oh, I am sorry. I _________ dinner at my friend's home.[ ]

A. have had

B. had

C. was having

D. had had

下列说法中不符合弗洛伊德关于“心理结构”的看法的是（）

A、人的心理结构具有层次性

B、潜意识层占据的心理空间大于意识层

C、由潜意识、前意识和意识构成

D、“力比多”决定了人的心理结构

E、以上都不是

轴承发生腐蚀的主要原因是什么？