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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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

3.單項選擇題A light is（）from Changshanzui,the SE extremity of the island.

A.exhibited
B.established
C.constructed
D.built

4.單項選擇題Integrated Bridge and Navigation Systems(IBS/INS) provide excellent performance and reliable navigation under all conditions by（）.

A.integrating well-proven, harmonizing equipment
B.integrating all equipment in the bridge
C.an intelligent platform with ECDIS and Radar
D.the control center based on ECDIS

5.單項選擇題The lowest point between two waves is called（）.

A.though
B.tough
C.through
D.trough