题目内容

The radiator cap is designed to seal ______ so that it operates under some pressure.

A. the lubricating system
B. the cooling system
C. the ignition system
D. the fuel system

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The thermostat is designed to close off the flow of water from engine to_____ until the engine has reached the desired operating temperature.

A. fan
B. radiator
C. intake manifold
D. water pump

It is necessary to use a nonfreezing solution in the _____of water-cooled engines.

A. ignition system
B. fuel system
C. lubricating system
D. cooling system

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

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

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