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
单项选择题 The inner part of the condenser should be cleaned with （）.
单项选择题 The injector pump is operated by a cam which drives the plunger （）.
单项选择题 The injector pump is operated by a cam which drives the （） up and down.
