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【单选题】
When turning a ship in restricted space with a strong wind, it is normally best to ______A.
go ahead on both engines with the rudder hard to one side, if on a twin-screw vessel
B.
back down with the rudder hard to one side, if on a single-screw vessel
C.
take advantage of the tendency to back to port, if on a twin-screw vessel
D.
turn so that the tendency to back into the wind can be used, if on a single-screw vessel
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【单选题】一个带有气隙的铁芯线圈,接到电压一定的直流电源上,若气隙增大时,则线圈中的
A.
电流增大，磁通增大
B.
电流不变，磁通减小
C.
电流不变，磁通增大
D.
电流减小，磁通减小
【单选题】一个带有气隙的铁芯线圈,接到电压一定的直流电源上,若气隙增大时,则线圈中的
A.
A电流增大，磁通增大
B.
B电流不变，磁通减小
C.
C电流不变，磁通增大
D.
D电流减小，磁通减小