单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
The injector pump is operated by a cam which drives the （） up and down.
A.piston
B.drum
C.plunger
D.barrel -
单项选择题
The injector pump is operated by a cam which drives （） up and down.
A.the needle valve
B.the plunger
C.the piston
D.the cylinder
