单项选择题
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engineThe device most commonly used is a（）.
A.tachometer
B.pyrometer
C.dynamometer
D.calorimeter
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Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）
A.employing fuel oil as a cooling medium
B.preventing hard carbon deposit on nozzle tips
C.avoiding fuel oil temperature exceeding builder’s specification
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One of the advantages in the use of a dry liner over a wet liner is（）
A.it is fitted with neoprene O-ring seals
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One characteristic of a pulse type turbo-charging system is（）
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B.greatly fluctuating inlet manifold pressure
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