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單項(xiàng)選擇題

Sailing vessels are stand-on over power-driven vessels except（）.

A.in a crossing situation
B.in a meeting situation
C.when they are the overtaking vessel
D.on the inland waters of the PR China

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單項(xiàng)選擇題

Set of current is（）.

A.velocit in knot
B.irection from which it flows
C.estimated current
D.direction toward which it flows

單項(xiàng)選擇題

Several shoals（）reported to exist in the area south-west of the Brothers.

A.have
B.have been
C.has
D.has been

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