【单选题】
浮动床水垫层过高可导致床层在成床或落床时发生___现象。
A. 压实；
B. 乱层；
C. 过快；
D. 过慢。
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答案
B
解析
暂无解析
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用氯离子的浓缩倍率与碱度的浓缩倍率之差△JD来判断循环水结垢倾向时，当△JD___时，说明循环水已发生结垢。
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已知某标准NaOH溶液在保存中吸收了CO2，用此溶液来标定盐酸溶液，若以甲基橙做指示剂，则使盐酸溶液的浓度标定结果___。
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已知某标准NaOH溶液在保存中吸收了CO2，用此溶液来标定盐酸溶液，若以酚酞做指示剂，则使盐酸溶液的浓度标定结果___。
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【单选题】
配制500mL0.1mol/L的盐酸溶液，需量取4.2mL浓盐酸，下列哪种量取仪器的操作是正确的___。
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