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


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1.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

2.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