单项选择题

In the daytime，you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows（）.

A.a basket
B.a black ball
C.a black cone
D.two black cones

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单项选择题

In restricted visibility the speed of a vessel without operational radar may be（）enable effective avoiding action to be taken on sighting another ship.

A.too low to
B.too high to
C.too high for
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In restricted visibility a towed vessel must sound a fog signal when it is（）.

A.the last vessel in the tow
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In reduced visibility，you hear two prolonged blasts of a whistle. This signal is sounded by a （）.

A.power-driven vessel dead in the water
B.sailing vessel on the port tack
C.vessel not under command
D.vessel fishing with nets