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众所周知,在国民经济各部门生产建设中所选用的参数和参数系列,特别是产品的参数系列必须最大限度地采用“优先数和优先数系”。 我国早在1960年和1964年就分别颁布过属R系列的部标准和国家标准。目前,已形成国际标准的除R系列外,还有E系列。可见,“优先数和优先数系”的广泛应用,已为人们所熟知。然而,在我国的部（专业）技术标准中具体的应用还有值得商榷的地方。如JB2229-77“往复活塞式压缩机活塞力、行程参数”
As we all know, in the national economy in all sectors of production and construction of the parameters and parameters used in the series, in particular the product parameters must maximize the use of “priority number and priority number system.” As early as 1960 and 1964, China promulgated the ministerial standards and national standards of R series respectively. At present, in addition to the R series that has formed the international standard, there are E series. It can be seen that the widespread application of “priority number and priority number system” is well known. However, the concrete application in the technical standards of ministries (professional) in our country is still open to question. Such as JB2229-77 “reciprocating piston compressor piston force, travel parameters”