MG发病机制叙述不正确的是（） A.MG患者外周血中均能检测到AChR特异性抗体 B

近似数1.23×10⁵精确到（    ）位，有（    ）个有效数字．

选出下列所有正确的叙述。（）

A．外显子以相同顺序存在于基因组和cDNA中 

B．内含子经常可以被翻译 

C．人体内所有的细胞具有相同的一套基因 

D．人体内所有的细胞表达相同的一套基因 

E．人体内所有的细胞以相同的方式剪接每个基因的mRNA

句型转换。

1. Would you like to go to the park with us? (同义句)

    ________ ________ going to the park with us?

2. The computer is very useful. (改为感叹句) 

                                  the computer is!

3. My pet pig is so big. She can't sleep in the house. (同义句)

    My pet pig is                                              sleep in the house.

4. The girl is 6 years old. (同义句)

    She is a                girl.

5. She doesn't want that pen. She wants this one. (同义句)

    She wants this pen                               that one.

6. The best way of going there is by plane. (同义句)

    The best way                                              is by plane.

7. Why don't you get some flowers? (同义句)

                                 get some flowers?

根据实际经验，在视线良好时，对岛礁的辨认，从视距和清晰度方面下列正确的是：（）

A.雷达更有效且辨认清楚

B.雷达更有效但辨认不清楚

C.目力更有效且辨认清楚

D.目力更有效但辨认不清楚

设计文件中A4～A6级起重机的金属结构应进行疲劳验算。