單項(xiàng)選擇題In anchoring orders, up and down means（）.

A.the chain is not upright
B.the chain is tight
C.the chain is upright
D.the chain is slack


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1.單項(xiàng)選擇題In anchoring orders, walk back the chain means（）.

A.pay away the chain
B.take in the chain
C.check up the chain
D.take a strain on the chain

2.單項(xiàng)選擇題In reading a weather map, closely spaced pressure gradient lines would indicate（）.

A.high winds
B.high overcast clouds
C.calm or light winds
D.fog or steady rain

3.單項(xiàng)選擇題In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close quarters situation is developing or risk of collision exists. If so, she shall（）.

A.sound the danger signal
B.when taking action, make only course changes
C.avoid altering course toward a vessel abaft the beam
D.All of the above

4.單項(xiàng)選擇題In revised editions of admiralty charts the（）are corrected first.

A.smaller scales
B.larger scales
C.smaller scales and larger scales
D.moderate scales

5.單項(xiàng)選擇題In the doldrums you can expect（）.

A.steady, constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity