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單項(xiàng)選擇題

In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.

A.telescopic pipes
B.large bore
C.drilled passage
D.tied rod

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單項(xiàng)選擇題
In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.
A.crosshead
B.crankpin
C.crank journal
D.gudgeon pin
單項(xiàng)選擇題
In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.
A.additives
B.water
C.grease
D.acid solution