题目内容

顺绕的钢丝绳常用于起重机中。()

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大雾天气和六级以上大风时应当停止焊接作业。()

It is predicted that heavy rains are ______ to flood the harbor and its vicinity in a few

A. frightening
B. threatening
C. scattering
D. Warning

吊笼中乘人或载物时，应该使荷载均匀分布，防止偏重，严禁超载运行。()

It is dangerous for vessels without the use of radar______the estuary(河口)．

A. to get
B. to approach
C. to proceed
D. to close