题目内容

It is the responsibility of the crane operator to, at all times, be aware of the location

A. load
B. hook
C. boom
D. All of the above

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It is required that______should be used during the poor visibility if the radar’s screen shows heavy sea returns．

A. Gain Control
Brilliant Control
C. Anti-clutter Sea Control
D. Sweep Intercept

顺绕的钢丝绳常用于起重机中。()

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