【判断题】
胶液变成胶块是一种化学变化
A. 对
B. 错
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答案
B
解析
暂无解析
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【判断题】
分离热区换热器投用时，先打开冷态工作液体阀门和放空阀，向其注液，当表面达到规定位置时，缓慢或分数次开启蒸汽或热态其它液体阀门，做到先预热后加热，防止骤冷骤热，有损换热器使用寿命
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【判断题】
所有新员工（包括学徒工、外单位调入员工、合同工、代培人员和大中专院校毕业生、有技术岗位的季节性农民外用工等）必须经过三级安全教育，总教育时间不得少于72小时，并经考试合格后，方可上岗
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