In some cases it may be necessary to connect metal surfaces by means of a hard spelter solder which fuses at hight temperature.
某些情况下有必要用一种高熔融温度的强锌焊料来连接金属表面。
In some cases it may be necessary to connect metal surfaces by means of a hard spelter solder which fuses at hight temperature.
某些情况下有必要用一种高熔融温度的强锌焊料来连接金属表面。
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