單項選擇題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
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1.單項選擇題（）indicates the weight of the vessel and is,therefore,according to a well known principle of physics,equal to the weight of the water it displaces.
A.Gross tonnage
B.Net tonnage
C.Displacement tonnage
D.Deadweight tonnage
2.單項選擇題The mariner must be the final judge of the reliance he can place on the information given in the Admiralty charts and other publications,since they（）.
A.may always be complete and up-to-date
B.may not always be complete and up-to-date
C.may sometimes be complete and up-to-date
D.may not sometimes be complete and up-to-date
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