将pH=1的盐酸平均分成2份，1份加适量水，另1份加入与该盐酸物质的量浓度相同的适量NaOH溶液后，pH都升高了1，则加入的水与NaOH溶液的体积比为（ ）
| A．9﹕11 | B．10﹕9 | C．11﹕1 | D．12﹕1 |
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