废气锅炉允许的废气压力损失，对废气流速有重大影响，因为（）。

【名词&注释】

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[单选题]废气锅炉允许的废气压力损失，对废气流速有重大影响，因为（）。

A. 保持小的废气压力损失，则废气流速必然是低的
B. 废气压力损失与废气流速的平方成正比
C. 废气压力损失与管径4次方成反比
D. A，B，C均对

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[单选题]All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

A. the running-in period
B. the running process
C. gas exchange process
D. the boiler firing

[单选题]Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

A. boiler
B. heater
C. engine
D. cooler

[单选题]The complete assembly of bedplate, A-frames and cylinder block is held together by （） to form a rigid structure.

A. tap-bolts
B. jack-bolts
C. tie rods
D. fitted rod

[单选题]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

A. compression pressures are below normal
B. lube oil is diluted with fuel oil
C. cranking speed is too low
D. exhaust system is partially restricted

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