患者，女性，12岁，以"反复咳嗽、咳痰伴发热8年"入院。患者8年前在玩耍时突然出现剧

将大肠杆菌的核糖体用¹⁵N标记，并使该菌被噬菌体感染，然后把大肠杆菌移入含有³²P和³⁵S的培养基中培养，请回答：

(1)由实验得知，一旦噬菌体侵染细菌，细菌细胞内会迅速合成一种RNA，这种RNA含有³²P，而且其碱基能反映出噬菌体DNA的碱基比例，而不是大肠杆菌DNA的碱基比例，此实验表明：³²P标记的RNA来自于_____________________。

(2)一部分³²P标记的RNA和稍后会合成的带³⁵S的蛋白质均与¹⁵N标记的核糖体连在一起，这种连接关系表明__________________。

(3)³⁵S标记的蛋白质来自_________________，可用于_______________。

(4)整个实验能够证明：_____________________。

情景交际。

A: Your English is very good, Zhang Lei. Can you please tell me __1__ you learn it?

B: I learn English __2__ speaking as much as possible in and __3__ of class.

A: Do you learn English by watching English language __4__?

B: Yes, __5__ often. And I also listen to tapes.

A: Do you study grammar?

B: No, I never study grammar. It's __6__  and I don't think it is helpful.

A: I can't get the pronunciation right. What should I do?

B: Don't worry. Try to speak English as __7__ as you can. You can also__8__ it with your friends.

A: I enjoy reading English magazines, but my reading is usually slowed down by too many new words.

    __9__ should I do then?

B: You can always write the new words on a small piece of paper and study them when you are free.

A: Thank you very much!

B: It's my__10__. 

08-475道岔捣固车主动轮内侧距离为（）mm。

A、1435

B、1435±1

C、1353

D、1353±3

刺激G细胞分泌胃泌素的因素有（）

A.副交感神经兴奋

B.胃窦部黏膜接触蛋白质分解物

C.胃窦部潴留

D.胃窦部膨胀

E.胃排空加快

低压电机断路器过载延时保护特性？