This paper depicts the chemical composition, mechanical performance of X80 line pipes, giving emphasis to the welding materials and welding processes of fully automatic welding and manual welding.
文章叙述了X80管线钢的化学成分、力学性能，并重点介绍了采用全自动焊和手工焊的焊接材料及焊接工艺。
The composition and performance feature for the additive package of RHY4163 manual transmission fluid were introduced.
介绍了RHY4163手动变速箱油复合剂的组成及性能。
The composition and performance feature for the additive package of RHY4163 manual transmission fluid were introduced.
介绍了RHY4163手动变速箱油复合剂的组成及性能。
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