标准V形块两斜面的夹角有哪几种（）。 A.30 B.45 C.60 D.90 E.1_爱下问搜题

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问题多项选择题

标准V形块两斜面的夹角有哪几种（）。

A.30

B.45

C.60

D.90

E.120

答案

参考答案：C, D, E

选择题

The Acropolis ________ in the 5th century B. C. at a high altitude above the city in honour of

Athena, the goddess of Athens.[ ]

A. constructed

B. was constructed

C. has been constructed

D. is being constructed

单项选择题

MRI对比增强常用的对比剂是（）

A.泛影葡胺

B.GD-DTPA

C.优维显

D.欧乃派可

E.伊索显