题目内容

It is constructed to hold a large amount of water in tubes or other passages which provide a large area in contact with the atmosphere.

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In operation, the thermostat is designed to close off the flow of water from engine to radiator until the engine has reached the desired operating temperature.

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

Slow speed, stop-and-go operation means that the engine seldom gets hot enough to drive the water and vapor out of the crankcase.

Excessive friction in the engine, however, would mean rapid destruction.