常用消毒酒精的浓度为

A、<span style="FONT-FAMILY: &#39;Times New Roman&#39;; FONT-SIZE: 14px">99.8%</span>

B、<span style="FONT-FAMILY: &#39;Times New Roman&#39;; FONT-SIZE: 14px">30%</span>

C、<span style="FONT-FAMILY: &#39;Times New Roman&#39;; FONT-SIZE: 14px">70%</span>

D、<span style="FONT-FAMILY: &#39;Times New Roman&#39;; FONT-SIZE: 14px">50%</span>