如由铅、锡、锰、镍、铁、硅组成的铜合金。

If by lead and tin, manganese, nickel and iron, silicon composed of copper alloys.

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如由铅、锡、锰、镍、铁、硅组成的铜合金。

If by lead and tin, manganese, nickel and iron, silicon composed of copper alloys.

youdao