也可以是根据焊接的对象大小，设计成不同规格的喷锡口。
Also can be according to the welding object size, designed to different specifications of the mouth spray tin.
镀镍前或锡电镀间的阴极接触不良，放电火花将铜材熔成凹洞。
Before or tin plating nickel plating of bad contacts between the cathode, discharge sparks will melt into hollow copper hole.
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