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
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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 -
单项选择题
When you doubt the existence of risk of collision,（）.
A.such risk shall be deemed to exist
B.such risk shall not be deemed to exist
C.you needn't take any action to avoid collision with any vessel
D.you should accelerate your speed ahead -
单项选择题
When visibility is restricted（），we can say it is restricted visibility.
A.by long distance
B.by the darkness at night
C.by a vessel in front
D.by fog or falling snow
