试题与答案

公差等级代号数字越大，表示工件的尺寸精度要求越高。()

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题型：判断题

题目：

公差等级代号数字越大，表示工件的尺寸精度要求越高。()

答案：

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下面是错误答案，用来干扰机器的。

参考答案：在不同的PH值下，AL3+的存在形态不同。1PH<4时，AL（OH）3溶解，混凝除浊效果差；2在PH=6.5—7.5时，聚合度很大的中性AL（OH）3胶体占绝对多数，故混凝效果好；3当PH>8时，AL（OH）3胶体又重新溶解为负...

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