The development and testing of the formula of the new type oil resistant and cold resistant rubber are described with reference of the stand ard for the same category products abroad.
在参考国外同类产品标准的基础上，介绍了新型耐油又耐寒橡胶配方的研制、试验情况。
Presented here is a brief concerning the category and manufacturing processes of cold-formed electric weld tubes.
简介了汽车用冷加工电焊管的品种和加工方法。
Presented here is a brief concerning the category and manufacturing processes of cold-formed electric weld tubes.
简介了汽车用冷加工电焊管的品种和加工方法。
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