能提供细菌生长所需辅酶的培养基成分是（）
A．蛋白胨
B．血液
C．糖类
D．牛肉膏
E．无机盐类
参考答案：B
----How about going hiking this weekend?
----Sorry, I prefer _____rather than _____.
A．to stay at home, go out
B．to go out, stay at home
C．staying at home, go out
D．going out, stay at home.
简述发展养兔生产的制约因素和发展策略。
