单项选择题

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

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

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单项选择题Keep clear（）the buoy.

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

In the International Code of signals，a group of three l...

单项选择题In the International Code of signals，a group of three letters indicates（）.

A.urgency or an emergency
B.the vessel's national identity signal
C.a group from the general signal code
D.a group from the medical signal code

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