用Na 2 CO 3 作基准物质标定HCl溶液时,如果 Na 2 CO 3 中含有少量NaHCO 3 ,则标定出的HCl溶液的浓度 ( )
A.
偏高
B.
偏低
C.
视所用的指示剂而定
D.
无影响
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【单选题】听力原文:W: Hello, Mr Fletcher. You look rather tired this morning. Did you have a difficult journey back from Scotland? M: Well, the business trip was successful but the train arrived four hours late and...
A.
The man's business trip was successful.
B.
His train was delayed.
C.
His journey back from Scotland took him four hours.