單項選擇題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


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1.單項選擇題One of the factors which affects the circulation of ocean currents is（）.

A.humidity
B.varying densities of water
C.vessel traffic
D.the jet stream

2.單項選擇題If a seaplane is not used as a means of transpiration on water but is capable of being used so，it shall（）.

A.be regarded as a vessel not under command
B.be regarded as a vessel underway
C.be regarded as a vessel
D.be regarded as a sailing vessel

3.單項選擇題If the circumstances of the case admit，any vessel（）in a narrow channel.

A.shall have the liberty to anchor
B.shall avoid anchoring
C.shall moor to a buoy when necessary
D.shall keep anchoring

4.單項選擇題A proper look-out must be kept（）.

A.only in fog
B.only between the hours of sunset and sunrise
C.only when entering and leaving port
D.at all times

5.單項選擇題If a vessel is engaged in fishing according to the definitions in the Rules，it will have （）.

A.gear extending from the side or stern
B.gear that restricts maneuverability
C.less than 50 percent trolling lines
D.None of the above