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本标准适用于机械结构、一般工程结构用无缝钢管。
This standard applies to rigid structure, average project construction to use seamless steel tube.
youdao
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阐述了无缝线路的基本结构和基木原理。
Basic structure and theory of LWR are elaborated in this paper.
youdao
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阐述了无缝线路的基本结构和基木原理。
Basic structure and theory of LWR are elaborated in this paper.
youdao