题目内容

The effective temperature of air is dependent upon ______. I. relative humidity II.

A. I only
B. II only
C. Both I and II
D. Neither I nor II

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In a ______boiler the hot gases from the furnace pass through the tubes while the water is

A. water-tube
B. fire-tube
C. exhaust gas
D. Composite

______continuously extract the crankcase atmosphere, via a pipe system, and move it past a

A. The oil mist detectors
B. The smoke detectors
C. An oily water monitor
D. Oil discharge monitoring and controlling system

Constant cooling the various components of diesel engine has a number of functions except

A. good lubrication
B. low thermal stress
C. good mechanical properties
D. acid corrosion

The cetane number of a diesel fuel oil indicates its ______.

A. ignition quality
B. acid content
C. heating value
D. viscosity

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