1252| 7
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衛(wèi)生級(jí)、化工級(jí)閥門壁厚相差4倍? |
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點(diǎn)評(píng)
壓力一樣的,介質(zhì)不用,鑄鋼的化工股、火電、泥漿、造紙等行業(yè)用的。
316的是制藥行業(yè)用的
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