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【单选题】
综合，在建筑群之间金属管的埋设深度不应小于（）A.
0.5m
B.
0.6m
C.
0.7m
D.
0.8m
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【单选题】Perhaps you think if someone is lonely, it’s their fault, or that since you’re so busy, you couldn’t possibly do anything to help. Loneliness can hit anyone from time to time, but if you’ve failed to ...
A.
When something unexpected has pulled people away from some of their friends, they will feel lonely.
B.
There are many reasons for people to feel lonely.
C.
Lonely people just aren’t busy enough
D.
When their close friends have moved away, people will feel lonely.
【简答题】皮带的整体拍摄要点