單項(xiàng)選擇題When two power-driven vessels are meeting head-on and there is a risk of collision,each shall().

A.stop her engines
B.alter course to starboard
C.sound the danger signal
D.back down


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1.單項(xiàng)選擇題The overall set in Malacca straight is to the NW, but from May to September there is a tendency for SE sets to prevail in some N and central parts.In this sentence,“set”refers to().

A.The direction of traffic flow
B.The direction of current
C.The direction of monsoon
D.The direction of wind