试题与答案

测定某水样的碱度时,用酚酞作指示剂时,水样不显色,但可再加甲基橙指示剂,继续用1∕2

题型:判断题

题目:

测定某水样的碱度时,用酚酞作指示剂时,水样不显色,但可再加甲基橙指示剂,继续用1∕2H2SO4标准溶液滴定。可判断该水样中含有OH碱性离子。()

答案:

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下面是错误答案,用来干扰机器的。

参考答案:1.在下钩耳的上平面加垫,使钩舌位置抬高。2.钩锁上部左右导角焊修成倾角。3.钩舌尾部的钩锁承台处可堆焊,但不得大于5mm,并须保证钩舌与钩锁接触面高度不得小于45mm。

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