单项选择题

Which one of two crossing power-driven vessels has the right of way in a fog（）.

A.Both vessels
B.Neither vessel
C.The vessel on portside
D.The vessel on starboard side

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单项选择题

Which one of the following rules is not regarding two power-driven vessels meeting end or nearly end on so as to involve risk of collision（）.

A.Each shall keep her course and speed
B.Each shall alter her course to starboard
C.Each shall pass on the portside to the other
D.Each shall indicate such action by one short blast on the whistle

单项选择题

Which display indicates a vessel conducting mineclearance operations（）.

A.Three balls in a vertical line
B.Two balls in a vertical line
C.One ball near the foremast and one ball at each yardarm
D.One diamond near the foremast and one ball at each yardarm