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valve bronze
met.
阀青铜
(2 ~ 10Sn, 3 ~ 9Pb, 3~9Zn,余量 Cu)
nautic.
阀青铜
锡 2% ~10%,铅 3% -6%,锌 3% ~6%,其余铜
nautic., tech.
阀用青铜
tech.
阀青铜
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