單項(xiàng)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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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

單項(xiàng)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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