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问题 单项选择题

电梯井口必须设定型化防护门；电梯井内应每隔两层并最多隔（）设一道安全网。

A.8m

B.9m

C.10m

D.12m

答案

参考答案：C

选择题

Yue Yue, ____2­year­old girl who was twice run over by vans and then ignored by 18 passers­by as she lay critically injured on a street, draws_____ concern from all over the country.

A．/；/

B．a；the

C．a；/

D．the；a
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单项选择题 A1/A2型题

半解剖式人工牙的牙尖斜度是（）

A.10°

B.15°

C.20°

D.25°

E.30°
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