Because of factory tolerances and the unitizedconstruction common to today's cars, this is rarely, if ever, the case.
由于工厂公差和单位化建设共同到今天的汽车,这是很少,如果以往任何时候都如此。
2
It has special unitizedconstruction which consists of the seat, disc and stem assembly, and strainer screen all together in one unit for complete replacement maintenance.