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【单选题】
换热器基础上活动支座的地脚螺栓装有两个锁紧螺母，螺母与底板之间应留( )的间隙，使底板能自由滑动。A.
０－３ｍｍ
B.
１－３ｍｍ
C.
２－４ｍｍ
D.
１－４ｍｍ
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【简答题】This is a story that happened 15 years ago but it has always stayed with me since then.On the way back from work every evening,more often than not there would be a homeless man standing at the exit o...
【单选题】The old man told us most of the story, but _______ the part about the murder.A．kept upB．kept ba
A.
181. The old man told us most of the story, but _______ the part about the murder. A．kept up
B.
kept back
C.
kept out
D.
kept down
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