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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A.of
B.to
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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
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