推荐回答（1个）
总体来说，当学徒学到基本掌握本岗位各项技能的时候，就可以单干了……当然了，还要再历练一下，才能完全胜任本职。
具体到做阀门这个工作……当自己可以独立做出来阀门的时候，就可以单干了。
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