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【单选题】
小王进行消毒效果监测时，对医院保存无菌器械的戊二醛消毒液进行采样。回实验室后，直接取戊二醛消毒液0.5ml倾注营养琼脂进行活菌计数，经37℃培养48h，结果平板长菌数为0cfu／平板，小王报告结果为0cfu／ml，评价为无菌，合格。下列是对小王错误操作的评价，你认为不正确的是（）。A.
没有加入相应的中和剂
B.
试验方法应该为无菌试验
C.
应该取样1.0ml进行活菌计数
D.
0cfu／ml并不代表无菌
E.
无菌试验需经37℃培养7d
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