[单选题]

半固体和固体培养基中的琼脂粉含量分别为

A.0.1%~0.2%;0.5%~0.8%

B.0.6%~0.9%;0.9%~1.2%

C.0.3%~0.5%;1.5%~2.5%

D.0.6%~1.0%;1.5%~3.5%

E.1.3%~2.5%;4.5%~6.5%

参考答案与解析: