單項(xiàng)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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)選擇題While underway at night you observe a vessel’s range lights in line off your starboard beam． You should（）.

A.come right
B.sound the danger signal
C.continue on your course
D.come left

4.單項(xiàng)選擇題You are in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.

A.stop your engines
B.sound two prolonged blasts of the whistle
C.sound the danger signal
D.slow to bare steerageway

5.單項(xiàng)選擇題You are approaching another vessel and are not sure whether danger of collision exists. You must assume（）.

A.there is a risk of collision
B.you are the give-way vessel
C.the other vessel is the give-way vessel
D.there is no risk of collision