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问题：
[单选题]有关基准物质的叙述不一定正确的是（ ）。
A、物质的组成应与化学式完全相符
B、超纯物质一定满足基准试剂对纯度的要求
C、试剂在一般情况下应该很稳定
D、试剂最好有比较大的摩尔质量
参考答案：
B
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