单项选择题
Oil will lubricate these parts （） effectively than water.
A.much
B.more
C.most
D.less
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相关考题
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单项选择题
Oil pressure in the lubrication system is （） the static sea water head to ensure that sea water （） the stem-tube.
A.lower than；can lubricate
B.lower than；can cool
C.higher than；can enter
D.higher than ；cannot enter -
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 -
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
