單項選擇題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


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1.單項選擇題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

2.單項選擇題In the doldrums you can expect（）.

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