單項選擇題There shall be two principal（）through the harbor for the passage of vessels of over 60 tons burden.
A.straits
B.channels
C.canals
D.roadsteads
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1.單項選擇題This new method not only saves time but also saves energy（）operating on two batteries instead of four.
A.in
B.by
C.on
D.for
2.單項選擇題This Rule does not relieve the give-way vessel（）her obligation to keep out of the way.
A.out
B.off
C.from
D.of
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（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.
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A tide is called diurnal when（）.
題型：單項選擇題
When the wave period and the apparent rolling period are the same（）.
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According to the relevant regulation, lifeboat should be powered by（）.
題型：單項選擇題