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單項(xiàng)選擇題

Should the vessel have no deratisation certificate at the time of her delivery，she（）be held to be unseaworthy.

A.shall
B.should
C.may
D.would

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單項(xiàng)選擇題

Proper use shall be made（）radar equipment if fitted and operational.

A.of
B.to
C.on
D.with

單項(xiàng)選擇題

Keep clear（）the buoy.

A.to
B.on
C.of
D.for

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