单项选择题
The bedplate must be rigid enough to support the weight of the rest of the engine, and maintain the crankshaft, which sits in the bearing housings in the （）, in alignment.
A.longitudinal girders
B.transverse girders
C.fore girders
D.aft girders
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相关考题
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单项选择题
Pressurized air enters the cylinder via the inlet ports and pushes the remaining exhaust gas from the cylinder in a process known as “（）”.
A.charging
B.super charging
C.scavenging
D.exhausting -
单项选择题
It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.
A.the suction stroke
B.the compression stroke
C.the expansion stroke
D.the exhaust stroke -
单项选择题
In the suction stroke, the crankshaft is rotating clockwise and the piston is moving （） the cylinderThe inlet valve is （） and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.
A.up；opened
B.down；open
C.up；closed
D.down；closed
