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1·Because of factory tolerances and the unitized construction 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 unitized construction which consists of the seat, disc and stem assembly, and strainer screen all together in one unit for complete replacement maintenance.

它具有特殊的整体结构，由阀座，阀瓣和阀杆总成，以及过滤器网等整合在一个整体中，完全能够进行更换维护。

3·As the research on arched corrugate sheet-truss unitized roof is in the initial stage, the specific construction scheme still needs further studies.

由于对拱形波纹板-桁架组合体系屋盖结构的研究尚处于起步阶段，具体施工方案还有待于进一步研究。