單項(xiàng)選擇題When a pushing vessel and a vessel（）ahead are rigidly connected in a composite unit they shall be regarded as a power-driven vessel.
A.is pushed
B.being pushed
C.was pushed
D.be pushed
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1.單項(xiàng)選擇題When a vessel is aground,（）.
A.she is underway
B.she is not underway
C.whether she is underway cannot be determined
D.she might be or not be underway
2.單項(xiàng)選擇題When did you check the contents of C02 cylinders（）.
A.by counting
B.by calculating
C.by weighing
D.by filling
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