單項選擇題

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

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單項選擇題

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

單項選擇題

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

When you doubt the existence of risk of collision,（）.

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When visibility is restricted（），we can say it is restricted visibility.

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

When visibility is restricted（），we can say it is restricted visibility.

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