单项选择题
A.as far as B.as soon as C.as close as D.as closer as
The inner part of the condenser should be cleaned with ...
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
The injector pump is operated by a cam which drives the...
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
