单项选择题
A.7~10cm B.10~15cm C.15~20cm D.19~20cm E.21~23cm
A.焚烧 B.紫外线消毒 C.浸泡消毒 D.高压蒸汽灭菌 E.辐射消毒
A.29% B.33% C.37% D.41% E.45%