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单选题
The term flood current refers to that time when the water（）.
A
is flowing towards the land
B
is moving towards the ocean
C
level is not changing
D
level is rising because of heavy rains
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单选题What describes a flood current（）.A
Horizontal movement of the water toward the land after high tideB
Horizontal movement of the water toward the land after low tideC
Horizontal movement of the water away from the land following high tideD
Horizontal movement of the water away from the land following low tide
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单选题Water may boil up around the stern of a vessel in a channel due to（）.A
slack water when upboundB
shallow waterC
a cross currentD
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单选题The term restricted visibility，when used in the Rules，refers to（）.A
situations when you can see vessels on radar that you cannot see visuallyB
visibility of less than half a mileC
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单选题Which statement about stopping a vessel is TRUE?（）A
A lightly laden vessel requires as much stopping distance as a fully laden vessel when the current is from asternB
A vessel is dead in the water when the back wash from astern operation reaches the bowC
A tunnel bow thruster can be used in an emergency to reduce the stopping distanceD
When a vessel is dead in the water any speed displayed by doppler log reflects the current
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单选题When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is （）A
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leadingC
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单选题When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.A
Add one hour to the times listed under the reference stationsB
Subtract one hour from the time differences listed for the subordinate stationsC
Apply no correction as the times in the reference stations are adjusted for daylight savings timeD
Add 15° to the standard meridian when calculating the time difference
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单选题To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）A
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30 minutes before the predicted time
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单选题A Doppler speed log indicates speed through the water（）.A
at all timesB
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单选题Stand of the tide is that time when（）.A
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单选题As a rule，ships of most configurations，when drifting in calm water with negligible current，will lie（）.A
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单选题When current and voltage reach maximum values at the same time, the power factor is（）A
minimumB
maximumC
leadingD
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单选题When is the density of the water required to be logged in the logbook of a ship?（）A
Any time the vessel moves from water of one density into waters of a different densityB
Prior to getting underway when the vessel is floating in fresh or brackish waterC
Only when the vessel moves from fresh water into salt waterD
The density of the water is not required to be logged in the unofficial logbook
考题
单选题The easiest way to anchor a vessel in a current is to（）.A
stem the current and make very slow headway when the anchor is droppedB
stem the current and be falling aft very slowly when the anchor is droppedC
stem the current and endeavor to make neither headway nor sternway when the anchor is droppedD
stop all headway through the water and keep the current astern when the anchor is dropped
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单选题Allowance for fresh water refers to（）.A
the provision to be provided when the vessel sails in fresh water areaB
the fresh water to be carried by a vesselC
the allowance of fresh water for each crew member when in distress at seaD
the amount of free board decreased when sailing in fresh water area
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单选题Conditions for crossing a rough bar are usually best at （）.A
low water slackB
high water slackC
high water ebbD
high water flood
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