gost-29074-91新版标准规范
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gost-29025-91新版标准规范
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gost-28964-91标准规范
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gost-28908-91-butterfly-valve-ball-valves-face-to-face-series-1-wafer-2
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gost-28798-90新版标准规范
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gost-28778-90参考标准资料
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gost-28778-90标准规范
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GOST-28759.8-90新版标准规范
Tpynna T47M E XK T O C y IA P CT B E HH bIIIPOKJIAJIKN METAJIJINYECKHEBOCbMNYTOJIHOTO CEYEHNAKoHcTpyKma H pa3Mepbl.TOCTTexHngeckHe TpeooBaHna28759.8-90Metal gaskets of octangular s...
GOST-28759.7-90新版标准规范
Tpyuna「47M E rO C yA P C T B E HH bI C TA H I A PTIIPOKIAIKM ACBOMETALINYECKMEKoncTpyKia H pa3Mepbl.rocTTexHmeckHe TpeooBanna28759.7-90Ashestos-metal gaskets.Design and dimensions...
GOST-28759.6-90新版标准规范
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