單項(xiàng)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
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1.單項(xiàng)選擇題Vessels，（）support vessels，should not enter the safety zone of a deepwater port unless clearance has been obtained from the Vessel Traffic Supervisor.
A.besides
B.excepted
C.otherwise
D.other than
2.單項(xiàng)選擇題The Rules state that vessels may depart from the Rules when（）.
A.there are other vessels in the vicinity
B.operating in a traffic separation scheme
C.engaged in a situation involving more than two vessels
D.necessary to avoid immediate danger
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