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问题 单项选择题

样品和鞘液管道应用漂白粉液清洗的间隔时间为（）

A.每月

B.每天

C.每季度

D.每周

E.每年

答案

参考答案：D

选择题
The girls _____ a game called Bomb happily when the teacher suddenly entered the classroom.
A. played
B. were playing
C. are playing
D. had played
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单项选择题

《药品生产许可证》申请换发在有效期届满前（）

A.30日

B.60日

C.3个月

D.6个月
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