单项选择题
It is dangerous for vessels without the operational radar（）the estuary.
A.to get
B.to approach
C.to proceed
D.to close
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相关考题
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Bales close to the deckhead should be covered to prevent（）.
A.damage by dripping sweat
B.damage by odor contamination
C.from striking structure
D.from steel rusty -
单项选择题
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
A.pressure gradient
B.Coriolis effect
C.aurora borealis
D.ballistic deflection -
单项选择题
When steering by autopilot,how often should the steering be checked?（）
A.12 times on each watch
B.When time allows
C.At least once a watch
D.No checking is necessary
