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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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
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
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
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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