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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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
以下不属于“美文”的散文集是（ ）
A. 周作人的《自己的园地》
B. 俞平伯的《燕知草》
C. 冰心的《笑》
D. 唐弢的《推背集》
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