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【单选题】
关于通风柜的使用,以下错误的是( )A.
实验结束后应立即关闭通风柜
B.
在没有实验操作时,通风柜内不能放置实验化学试剂
C.
使用的时候人站在或坐在柜前,将玻璃门尽量放低,手通过门下方伸进柜内进行实验
D.
当通风柜开始运行时,操作人员通风柜有15cm以上的距离。
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举一反三
【单选题】Criminal law prosecutes activities which are()
A.
unjust
B.
not right
C.
bad
D.
illegal
【简答题】听力原文：With the rapid development of modem technology, criminal activities related with Internet has seen a great increase in the last twenty years, and our government is calling for international coope...
【单选题】A film that tells about exciting criminal activities with someone in danger or under threat is a (n) _____ .
A.
detective film
B.
thriller
C.
action film
D.
horror
【单选题】Every passenger is to counter a potential terrorist attack or other criminal activities.
A.
screened
B.
went
C.
screen
D.
screw
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