单项选择题
The interface between the liquid seal (water) and the oil should be positioned （） possible to the bowl periphery.
A.as far as
B.as soon as
C.as close as
D.as closer as
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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 -
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
