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單項選擇題

The inner part of the condenser should be cleaned with （）.

A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12

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單項選擇題

The injector pump is operated by a cam which drives the plunger （）.

A.top and bottom
B.to and fro
C.up and down
D.back and forth

單項選擇題

The injector pump is operated by a cam which drives the （） up and down.

A.piston
B.drum
C.plunger
D.barrel

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