胚胎干细胞的获取不能通过以下哪种方式（） A.分离囊胚期胚胎的内细胞团 B.将桑椹胚

按要求做题。

1. we’re, relaxed, pretty time, not, in, about, Switzerland (连词成句)

2. I don't know how I can get to the zoo.（改成简单句）

    I don't know how                to the zoo.

3. To understand what he is saying is too difficult. (改成同义句）

                          too difficult to understand what he is saying

4. The students should wear their uniforms at school.（对划线部分提问）

5. I need to look up the word in the dictionary．（一般疑问句）

              you         to look up the word in the dictionary?

能兴奋体温调节中枢，使体温升高的激素是（）

A.雌激素

B.孕激素

C.促卵泡素

D.黄体生成素

E.催乳素

转炉对铁水的要求是什么？

设X为连续型随机变量，方差存在，则对任意常数C和ε＞0，必有( )．

A．P(|X-C|≥ε)≤DX/ε²

B．P(|X-C|≥ε)=E|X-C|/ε

C．P(|X-C|≥ε)≥E|X-C|/ε

D．P(|X-C|≥ε)≤E|X-C|/ε