单项选择题
Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.
A.the cylinder cover
B.the piston rings
C.the piston crown
D.the piston skirt
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相关考题
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单项选择题
No specific period is given for the renewal of the lubricating oil filter element as this should be done（） a figure of 0√7 bars is shown on the gauge.
A.whatever
B.whenever
C.wherever
D.whoever -
单项选择题
Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for （） and supercharging.
A.scavenging
B.starting
C.cooling
D.blowing -
单项选择题
Modem engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
A.make use of
B.have made the use of
C.by means of
D.make advantage of
