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[主观题]
[A] showed up [B] turned back [C] moved on [D] ran away
[A] showed up
[B] turned back
[C] moved on
[D] ran away
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[A] showed up
[B] turned back
[C] moved on
[D] ran away
第9题
当气温低于() ℃时,应采取保温措施,并不得对混凝土洒水养护。
A.-3
B.0
C.3
D.5
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