单项选择题
A.置(36±1)℃培养箱内,(24±2)hB.置(28±1)℃培养箱内,(5)天C.置(36±1)℃培养箱内,(48±2)hD.置(28±1)℃培养箱内,(48±2)h
A.0.75%B.0.85%C.85%D.75%
A.15B.30C.45D.60