一般来说，动物细胞体外培养需要满足以下条件①无毒环境②无菌环

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问题选择题

一般来说，动物细胞体外培养需要满足以下条件①无毒环境②无菌环境③合成培养基需加血清或血浆 ④温度与动物体温相近⑤需要O₂，不需要CO₂⑥需要O₂，也需要CO₂ [ ]

A．①②③④⑤

B．①②③④

C．①③④⑤⑥

D．①②③④⑥

答案

答案：D

补全对话，情景问答

选择合适的应答句
( ) 1. How many shirts are there on the bed? ( ) 2. What are they? ( ) 3. Is your teacher in the classroom? ( ) 4. What colour is his jacket? ( ) 5. What time is it?	A. It's four o'clock. B. Yes, she is. C. There are two. D. They are books. E. It is pink.

多项选择题

政策性银行的资金来源的政府性特点主要体现在（）

A.财政借款

B.财政贴息

C.税收减免

D.财政透支

E.财政投资