A.stop your engines
B.sound two prolonged blasts of the whistle
C.sound the danger signal
D.slow to bare steerageway
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A.there is a risk of collision
B.you are the give-way vessel
C.the other vessel is the give-way vessel
D.there is no risk of collision
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A vessel engaged in fishing shall keep out of the way of a vessel（）.
As look-out，you spot an object 45°off your port bow. You should report the object as（）.
A vessel constrained by her draught may，in addition to the lights prescribed for power-driven vessels in Rule 23，exhibit where they can best be seen（）or a cylinder.
A vessel engaged in fishing during the day would show（）.
A vessel（）when underway shall so far as possible，keep out of the way of a vessel not under command.
If the circumstances admit，（）of small alteration of course and speed shall not be taken to avoid collision.
If a vessel of special construction cannot fully comply with the Rules，her degree of compliance shall be determined by（）.
A vessel being towed will show（）.
A head-on situation at night is one in which you see（）.
A vessel conducting mine clearing operations will show（）.