题目内容

We______her letter last week. We don't know what has happened to her.

A. must receive
B. must have received
C. ought to receive
D. ought to have received

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67（）

A. release
B. conceal
C. discover
D. expose

The mystery guest on the show is ______ other than the president.

A. on
B. none
C. not
D. nothing

下列不属于药品库要求的是( )。

A. 良好的通风
B. 防爆电源
C. 灭火装置
D. 良好的光照

燃烧爆炸性固体试剂存放时室内温度不能超过( )℃。

A. 30
B. 35
C. 40
D. 20