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

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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

单项选择题

When underway in a channel，you should keep to the（）.

A.Middle of the channel
B.Starboard side of the channel
C.Port side of the channel
D.Side of the channel that has the widest turns