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问题 单项选择题

各单项工作环境影响评价划分为( )个工作等级。

A．2
B．3
C．4
D．5

答案

参考答案：B

选择题
Leonardo da Vinci (1452 - 1519) _____ birds kept in cages in order to have the pleasure of setting them free.

A. is said to be buying
B. is said to have bought
C. had said to buy
D. has said to have bought
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单项选择题

关于拔牙窝的处理，哪一项是正确的

A．拔牙窝过高的牙槽中隔可待自行吸收

B．扩大的拔牙窝需要压迫复位

C．与粘骨膜相连的骨折片应及时取出

D．滞留乳牙拔除后应彻底搔刮拔牙窝

E．撕裂的牙龈出血应用碘仿纱条填压止血
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