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。