超星 - 主机冷却水系统测试

单选题

The cooling water of diesel engine should be treated because the ___.

A. cooling water is alkalescence
B. cooling water has acidity
C. cooling water has salinity
D. cooling water has impurity

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单选题

In a common oil cooler circulated by sea water, the oil is at a ____ pressure than the sea water.

A. larger
B. safety
C. lower
D. bursting

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单选题

Vents are led from the engine to ____ for the release of air from the cooling water.

A. the cooling jackets
B. the head tank
C. the cooling water pump
D. the scavenging box

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单选题

What is head tank in the closed cooling water system used for?

A. for the release of air from the cooling water
B. providing expansion room for heated cooling water
C. a place for implementing water and water treatment agent
D. any of the others

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单选题

If a kind of liquid is used to cool the diesel engine, it is invariably called _____.

A. lubricant
B. coolant
C. combustion product
D. second refrigerant

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