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【单选题】
为了抑制苯酚菌的分解活动而采取的保存方法是( )A.
加入 HgCl2
B.
用H3PO4调至pH为4时，加入适量CuSO4
C.
用HNO3酸化至pH为1～2，
D.
加入HNO3(至pH＜1)和K2Cr2O7(0.05%)
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