单项选择题

（） 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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单项选择题

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

单项选择题

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

单项选择题

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