当输油管道采用地沟敷设时,地沟顶部埋深一般不大于()m。
A.0.2m
B.0.3m
C.0.4m
D.0.5m
参考答案:D
It was about ten minutes after we arrived at a small village __________ it began to pour down.
A.when
B.where
C.that
D.how
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