单项选择题

It is dangerous for vessels without the use of radar ______ the estuary．
A.To get
B.To approach
C.To proceed
D.To close

A.A.To
B.To
C.To
D.To
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单项选择题
A compass card without north-seeking capability that is used for relative bearings is a（n）______．A.Bearing circleB.PelorusC.Bearing barD.Alidade
A.A.Bearing
B.Pelorus
C.Bearing
C.Alidade
单项选择题
Which of the following statements is TRUE regarding crane operations ________．A.Radio communications allow the crane operator to disregard the use of hand signalsB.The crane operators and signalman must be familiar with the correct hand signalsC.The forward cranes can be operated from the bridgeD.The aft cranes can be operated from the aft steering station
A.A.Radio
B.The
C.The
D.The
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