单项选择题
A.lower than；can lubricate B.lower than；can cool C.higher than；can enter D.higher than ；cannot enter
Oil is supplied to the cylinder wall and （） by means of...
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
No specific period is given for the renewal of the lubr...
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
Modem engines make use of exhaust gas driven turbo-char...
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
