题目内容

Forced air circulation is provided by a fan of generous capacity which is driven from the engine _____ by a belt or by fan blade formed in the flywheel.

A. camshaft
B. rocker arm
C. crankshaft
D. connecting rod

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It is necessary to use a nonfreezing solution in the cooling system of _____ engines.

A. air-cooled
B. water-cooled
C. gasoline
D. diesel

We cannot eliminate internal friction, but we can reduce it to a controllable degree by the use of ______.

A. coolant
B. antifreeze
C. lubrications
D. acid

By______ , reduce friction between moving parts of engine.

A. lubrications
B. antifreeze
C. coolant
D. acid

By______ , prevent leakage between parts such as pistons, rings and cylinders.

A. antifreeze
B. water
C. coolant
D. lubrications