轨道道岔质量要求及允许偏差，心轨和护轨工作边间距，900毫米轨距为（）毫米。A、87

阅读理解。

30th September

Dear Jayne,  

　　How are you? I hope everything is getting on well with you.  

　　I returned to my home on the morning of September 28th, at 2 am. I am so

sorry for not calling you as soon as I came back home.  

　　I have been allowed to stay at home for two days (from September 29th to

September 30th) to have a rest. The Chinese National Day is on October 1st. We

have a seven-day off for National Day holiday.  I will stay at home to have a

good rest.  

　　Thank you for your help.  I miss you and your kindness.  I miss the climate

in England in summer, too.  It is neither too hot nor too cold.  Now it is still very

hot in most parts of China, especially in the south of China, for example, in

Guangzhou.  The sun seems to dry up everything. We have to use air conditioner

to make the air cool enough so that we can have a good sleep at night.  

　　I will continue my work on October 8th.  After I start my work, it will be

too busy for me to do anything that I want to do, but I will try my best to get in

touch with you.  

　　Best wishes.                                          

                            Yours sincerely,                                                                          

                                     Sunny

1. How many days will the writer stay at home to have a rest?

A. Two.            

B. Seven.          

C. Eight.            

D. Nine.

2. Which country is the writer in at the moment?

A. China          

B. the UK            

C. America      

D. Japan

3. What does the weather like in England in September?

A. Hot            

B. Cool            

C. Cold          

D. Rainy

4. Which country is Jayne from?

A. The UK      

B. The USA            

C. Canada        

D. China

5. From the passage,we know that ___________.

A. Jayne is helpful and kind                

B. Jayne is friendly

C. the writer can get on well with Jayne        

D. A,B,and C

经动脉导管栓塞治疗上消化道出血最常见的并发症是（）

A.栓塞脏器组织缺血坏死

B.腹腔出血

C.胆血症

D.门静脉血栓形成

E.肺栓塞

化学就在我们身边，它与我们的生活息息相关。请按要求从下列物质中选择填空（填序号）：①石墨 ②氯化钠 ③生石灰 ④红磷 ⑤酒精 ⑥水

（1）属于有机物的是        ；

（2）具有优良导电性能的是        ；    

（3）用作某些食品干燥剂的是       ；

（4）用来腌制食品的是        ；        

（5）相对分子质量最小的氧化物       ；

（6）燃烧产物是固体的是        。

C1脂酶抑制剂缺乏会导致（）。

A.原发性B细胞缺陷

B.重症联合免疫缺陷

C.原发性补体缺陷

D.遗传性血管神经性水肿

E.多发性骨髓瘤

关于膜电位的描述，正确的是（）

A.极化是指静息时细胞膜两侧外正内负的分极状态

B.去极化是指膜内电位负值减小的过程

C.反极化是指跨膜电位为外负内正的状态

D.复极是指膜内电位负值增大恢复极化的过程

E.超极化是指膜内电位负值超过静息电位的水平