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【简答题】
简述什么是覆盖?什么是交换?它们之间有什么区别?
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反馈参考答案：
举一反三
【单选题】What's the author's tone in the last sentence of the passage?
A.
objective
B.
ironical
C.
approving
D.
enthusiastic
【单选题】What's the author's attitude shown in the passage?
A.
Supportive to the scientists' research.
B.
Opposed to the lead pollution.
C.
Just descriptive of an on-going fact.
D.
Positive to the prospect of the solution of lead pollution.
【单选题】What's the author's attitude towards the future of earthquake control ?
A.
pessimistic
B.
optimistic
C.
negative
D.
neutral
【单选题】What's the author's attitude towards the solution to drunken driving in the United States?
A.
Ironical.
B.
Causal.
C.
Optimistic.
D.
Realistic.
【单选题】What's the author's attitude towards the waste of the earth's resources ?
A.
Negative.
B.
Positive.
C.
Neutral.
D.
Enthusiastic.
【单选题】What's the author's attitude to the policy that prevents students with bad grades from participating in extracurricular activities?
A.
supportive
B.
critical
C.
neutral
D.
indifferent
【简答题】What's the author's opinion about the new AI movement?
【单选题】某工程有前后两道施工工序，在4个施工段组织时间连续的流水施工，流水节拍分别为4天、3天、2天、5天与3天、2天、4天、3天，则组织时间连续时的流水步距为( )天。
A.
2
B.
3
C.
4
D.
5
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