单项选择题
The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）
A.sliding the camshaft along its axis
B.rotating the cam 180
C.rotating the cam followers 180
D.moving the idler sprockets in the drive chain
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相关考题
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单项选择题
A diesel engine is equipped with an isochronous hydraulic governorA decrease in load will cause the engine speed to （）
A.decrease only
B.increase only
C.decrease slightly then returned to original speed
D.increase slightly then returned to original speed -
单项选择题
The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）
A.speed, torque, and horsepower production
B.firing order, valve timing, and valve lift
C.fuel consumption, efficiency, and cylinder pressure
D.scavenge pressure, compression ratio, and exhaust pressure -
单项选择题
Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）
A.maintain low pH in the cooling water
B.reduce the cooling water temperature
C.increase cooling water hardness
D.form a protective film on metal surfaces
