單項選擇題Our ship has not been to shipyard for a long time, the fouling on the ship’s hull greatly decreases her().

A.resistance
B.weight
C.speed
D.displacement


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1.單項選擇題Radar is not only to obtain(),but also to measure their distance away from you.

A.brightness of obtain
B.color of targets
C.shape of targets
D.bearing of objects

2.單項選擇題The anchor was then()and the siren sounded.

A.aweigh
B.weight
C.weigh
D.weighing

3.單項選擇題Are there many()and warehouses in the port?

A.wharf
B.wharves
C.wharve
D.wharfs

4.單項選擇題The quartermasters()steer the ship and help the officer keep lookout.

A.duty
B.on duty
C.at duty
D.in duty

5.單項選擇題The captain is in()command of the ship.

A.overall
B.over
C.all
D.task