A.reduce current pulsations
B.reduce brush chatter
C.prevent uneven commutator wear
D.allow greater power generation
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A.varying the DC exciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of the prime mover
D.shorting out part of the armature windings
A.a rheostat
B.a balancing coil
C.changing field excitation
D.adjusting the governor settings
A.32~5 amps
B.25 amps
C.1~5 amps
D.30 amps
A.the rudder angle indicator reading
B.the desired rudder angle reading
C.the measured rudder angle reading
D.the intended rudder angle reading
A.the rudder should be moved through its full extent
B.the rudder should be moved in starboard direction
C.the rudder should be moved with the ship at maximum speed
D.the rudder should be moved with the ship at minimu
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The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
Under MARPOL Code the ship to which it applies has to carry （）
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.