助焊剂应于使用50小时后全部更换新液，以防污染、老化衰退影响作业效果与品质。
The flux should not be used over than 50 hours. If so, it should be changed completely. Otherwise, the soldering quality cannot be guaranteed.
助焊剂应于使用50小时后全部更换新液，以防污染、老化衰退影响作业效果与品质。
The flux should not be used over than 50 hours. If so, it should be changed completely. Otherwise, the soldering quality cannot be guaranteed.
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