管子只需内表面脱脂时，可封闭一端灌入脱脂剂，再封闭另一端，水平放置15-20min转动（）次。_初级管工考试_全学科试题题库

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管子只需内表面脱脂时，可封闭一端灌入脱脂剂，再封闭另一端，水平放置15-20min转动（）次。
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