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 your vessel enters thick fog，she should sound（）every two minutes in accordance with these Rules.

A.one short blast
B.one prolonged blast
C.two short blasts
D.three short blasts

單項選擇題

Where does the look-out man stand?（）.

A.In positions in which the noises in the ship are least likely to interfere with the hearing of a fog signal and the man can see clearly
B.In positions in which the noises in the ship are much likely to interfere with the hearing of a fog signal
C.In positions in which the hearing of a signal is reduced to a minimum
D.In a position in which the man can see clearly