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【单选题】
空间结构体系中，筒壳的空间工作是由壳板、和横隔梁协同完成的，它的跨度在（ ）以内是有利的。A.
15m
B.
20m
C.
25m
D.
30m
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【多选题】What are the causes of most car accidents?
A.
Running stop signs
B.
Drowsy driving (Driver fatigue)
C.
Using mobile phone while driving
D.
Running red lights
E.
Drunk driving
F.
Speeding
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