A.cooling water
B.vapor from the boiler
C.starting air
D.hot gases
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A.constant
B.pulse
C.high
D.none of the above
A.piston crown
B.piston groove
C.piston skirt
D.piston ring belt
A.craned out
B.rolled out
C.lifted out
D.turned out
A.aluminum-plated
B.bronze-plated
C.zinc-plated
D.chromium-plated
A.must be provided
B.may be provided
C.have provided
D.can be provided
最新試題
The minimum speed an engine must attain before ignition can occur depends upon （）.
In using reduction gears to obtain efficient propeller speeds, （）.
The main purpose of the piston oil scraper rings is to （）.
The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing workThis is known as （）.
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Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
The highest pressure in a diesel engine cylinder normally occurs （）.
If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
The function of diesel engine piston compression rings is to （）.