單項(xiàng)選擇題If two sailing vessels are running free with the wind on the same side, which one must keep clear of the other?（）.
A.The one with the wind closest abeam
B.The one to windward
C.The one to leeward
D.The one that sounds the first whistle signal
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A.a dredge and widen
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Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
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