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问题 选择题

已知平面α与β所成的二面角为80°，P为α、β外一定点，过点P的一条直线与α、β所成的角都是30°，则这样的直线有且仅有[ ]

A.1条

B.2条

C.3条

D.4条

答案

答案：D

单项选择题

风寒表证的特征是（）

A.发热轻而恶风

B.恶寒重发热轻

C.发热重恶寒轻

D.恶寒发热交替

E.但发热不恶寒
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单项选择题

It has been said that most of the structural faults of technical reports result from the author’s () with what he is writing that he neglects to worry enough about how and for whom he is writing.

A. so much concerned

B. too much concerned

C. being so concerned

D. being too concerned
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