【单选题】
校正0℃时温度常用标准品为___。
A. 水--冰
B. 干冰
C. 盐--冰
D. 盐--水
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答案
A
解析
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直接配制标准溶液时必需使用___试剂。
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滴定Ka<10-7的更弱的酸,在水溶液中不能直接滴定,但可在下列介质中滴定___。
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空心阴极灯的光强度与灯的工作电流有关,电流增大,发射强度___。
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下列溶液中属于电解质的是___。
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用玻璃电极测溶液的PH值,是因为玻璃电极电位与___成正比。
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在下列溶液中加AgNO3,不出现沉淀的是___。
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在0.1M氨水中,加入少量的NH4Cl晶体,则NH3·H2O的电离度___。
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