-50 ℃ 15MnNiNbDR钢制2000 m3乙烯球罐的安装工艺
-50 ℃ 15MnNiNbDR강제2000 m3을희구관적안장공예
Installation Technology of -50 ℃ 2000 m3 Ethylene Spherical Tank Using 15MnNiNbDR Steels
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