据下表回答：（） A．缺少正常pH的对照组 �

据下表回答：（）

A．缺少正常pH的对照组 B．实验结果预期不正确

C．检验实验结果的试剂选择不恰当 D．实验操作步骤的安排不合理

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据下表回答：（ ） A．缺少正常pH的对照组 �

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据下表回答：（） A．缺少正常pH的对照组 �