单项选择题A separate piston cooling system is used () any contamination from piston cooling glands to the piston cooling system only.

A.to help
B.to limit
C.to protect
D.to remove


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1.单项选择题A reduction in load on a diesel engine results in () of speed of the crankshaft.

A.a reduction
B.an increase
C.an outing
D.a downwards

2.单项选择题A number of cylinder liners are enclosed in one cast iron casing to form a ().

A.cylinder cover
B.cylinder block
C.cylinder frame
D.bed-plate

3.单项选择题A main bearing consists of two shells which are secured by means of studs and ().

A.tie rods
B.through bolts
C.lead wires
D.bearing caps

4.单项选择题A lubricant often has to perform many duties in any situation, in addition to its fundamental job of ().

A.resisting oxidization
B.reducing friction
C.promoting moving speed
D.developing inertia

5.单项选择题A level gauge for a tank is to ().

A.give the pressure
B.give the contents
C.give the shape of the tank
D.give the accuracy level

6.单项选择题A hot air start pipe indicates that there is ().

A.inefficient cooling
B.a leaking air start valve
C.a clogged drain valve
D.a leaking air bottle

7.单项选择题A high temperature alarm or () which will melt is used to guard against the explosion of compressor air pipelines.

A.a flame trap
B.a relief valve
C.a fusible plug
D.a bursting cap

10.单项选择题A governor automatically controls engine speed by regulating ().

A.fuel supply
B.firing order
C.engine load
D.oil level