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单选题
A power-driven vessel leaving a quay or wharf must sound what signal? （）
A
Three short blasts
B
A long blast
C
A prolonged blast
D
No signal is required
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any sailing vessel with or without machinery for propellingD
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vessel that is overtaking herC
seaplane on the waterD
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stand-on vessel and would sound two short blastsB
give-way vessel and would sound no whistle signalC
stand-on vessel and would sound no whistle signalD
give-way vessel and would sound two prolonged blasts followed by two short blasts
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单选题Which statement is TRUE concerning the danger signal?（）.A
When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signalB
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单选题Power-driven vessels must keep out of the way of sailing vessels except（）.A
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privileged vessel and would sound two short blastsB
burdened vessel and would sound two prolonged blasts followed by two short blastsC
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单选题A vessel engaged in replenishment or transferring persons，provisions or cargo while under way can be regarded as（）.A
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单选题Which statement correctly applies to a situation where a sailing vessel is overtaking a power-driven vessel（）.A
The power-driven vessel must keep out of the way of the sailing vesselB
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The sailing vessel must keep out of the way of the power- driven vesselD
The vessel which has the other vessel to the right must keep out of the way
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A vessel engaged on pilotage dutyC
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单选题A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and （）.A
one sidelight and the masthead light are visibleB
the vessels will pass closer than half a mileC
both vessels sound one prolonged blastD
both sidelights and masthead light(s) are visible
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