單項(xiàng)選擇題Due to () action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

A.reciprocating
B.rotating
C.running
D.removing


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2.單項(xiàng)選擇題Dirty oil must be () before being used again.

A.mixed with clean oil
B.purified
C.heated
D.strained

3.單項(xiàng)選擇題Dirt in the fuel oil system of a diesel engine can cause ().

A.clogged filters
B.poor combustion
C.overloading of the diesel
D.shock of fuel lines

4.單項(xiàng)選擇題Diesel oil may be used to cool () of a diesel engine.

A.cylinders
B.exhaust valves
C.pistons
D.fuel valves

5.單項(xiàng)選擇題Diesel engines are started by supplying () into the cylinders in the appropriate sequence for the required direction.

A.fuel oil
B.diesel oil
C.compressed air
D.jacket water