Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with _______.

A．excessive speed

B．improper warm-up

C．extreme misalignment

D．inadequate lubrication

[单选题]When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for workA．remains the sameB．is reducedC．is increasedD．is eliminated

[试题]She had an outward______(appear)，but deep down she was really worried.

[单选题]How many teeth didthe dentist [take out]?A.digB.drawC.pullD.extract

[单选题]英语tooth→teeth采用的语法手段是（）。A . 加词尾B . 加词缀C . 变换重音的位置D . 词根内部音素的变化

[单选题]The_______in the steering gear move the rudder to the required angleA．control equipmentB．power unitC．transmission mechanismsD．fittings and pipeline

[单选题]（） for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.A . The driven gearB . The driveC . The greaseD . The lubricating oil

[单选题]Lubrication for the main reduction gears used with diesel engines is usually supplied byA．oil from the main engine sumpB．an independent lube oil systemC．the stern bearing head tankD．the stem bearing sump tank

[单选题]The follow-up gear on an electro-hydraulic steering gearA．relieves excessive fluid pressureB．takes the pump off stroke when the desired rudder angle is attainedC．allows for rudder movement faster than the movement of the ship&39;sD．returns the rudder

[单选题]G．ear pumps are widely used to transfer any one of the following but .A．fuel oilB．lube oilC．hydraulic oilD．fresh water

[单选题]Positive displacement, helical gear pumps are well suited for pumping oil becauseA．stuffing boxes eliminate the leakage problems usually associated with other gear pumpsB．it is not necessary to closely maintain design clearances with this pumpC．they