What pH of the standard solutions should be used for calibration when measuring acid solution with acidity meter?
A、6.86 and 4.00;
B、6.86 and 9.18;
C、4.00 and 9.18;
D、All above.
发布时间：2025-10-14 09:23:30
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答案：6.86 and 4.00
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