挑战习题
1/5单选题
难度:

1.配制一定物质的量浓度的NaCl溶液时,造成浓度偏低的原因可能是
A 定容摇匀后,有少量溶液外流
B 定容时,俯视液面
C 称量时,在天平托盘上放上称量纸,将NaCl固体放在纸上称量
D 溶解NaCl的烧杯未洗涤
提示1:
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正确答案:RA==
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