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【单选题】
自吸式离心泵吸入真空度过大而不能排水，可能是＿＿。A.
叶轮破损
B.
密封环间隙大
C.
轴封填料老化
D.
吸入滤器堵塞
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反馈参考答案：
举一反三
【单选题】Criminal law prosecutes activities which are()
A.
unjust
B.
not right
C.
bad
D.
illegal
【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
【简答题】Although they put up a _______of honesty, I knew that they were involved in various criminal activities.
【简答题】Although they put up a ____ of honesty, I knew they were involved in various criminal activities.
【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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