單項(xiàng)選擇題（） neutralizes the acid conditions and（） cleanses the rings and grooves.

A.The detergency；the alkalinity
B.The alkalinity；the detergency
C.The inhabitant；the water
D.The additives；the distilled water


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1.單項(xiàng)選擇題（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A.An air receiver
B.An operating valve
C.An automatic valve
D.An air distributor

2.單項(xiàng)選擇題（） is made of a boss with separated blades mounted into it.

A.A variable pitch propeller
B.A variable pitch nut
C.A fixed pitch parallel
D.A fixed pitch screw

3.單項(xiàng)選擇題（） is fully floating in both connecting rod small end and the piston skirt.

A.The piston rod
B.The cross head pin
C.The gudgeon pin
D.The crank-pin

4.單項(xiàng)選擇題（） is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank.

A.A filter
B.A centrifuge
C.A distiller
D.A generator

5.單項(xiàng)選擇題（） is a source of power by which the diesel engine may operate.

A.Water energy
B.Electrical energy
C.Chemical energy
D.Heat energy