简述筛分试验的原则程序？

阅读理解。

     Washington D.C. is the capital of the United States. It's the center of national government. It's a busy, working city with a large population. But what is more, Washington is also a city of history and culture. It is

  home to many famous and interesting public buildings and monuments, many of which are connected with

  the federal government.    

     Washington was created in 1790, when Congress (the highest lawmaking body of the United States)

  decided to place the nation's new capital in the east of the country. It was built half way between the

 northern and southern states of America. And of course it was named after George Washington, the first

 President of the United States.

     There are many tourist sights in Washington. Perhaps the most important tourist sight is the Capital

 Building. This is the house of the Congress. Another world-famous building in Washington is the White

 House. This is the home and office of the President of the United States. Most visitors are, however,

  surprised by how small the White House actually is.

     Washington is also a great cultural city. The Library of Congress contains one of the largest library

  collections in the world. The Smithsonian Museum holds the nation's largest collection of cultural

 materials. And the John F. Kennedy Center is a famous center of art and culture. It has many great

 musical and theatre performances throughout the year.

1. From the passage we know that Washington is situated in _____.

    A. the east, on the middle point from north to south of the country

    B. the center of the U. S. A.

    C. the east of the U. S. A.

    D. the east and halfway away from the north

2. The passage mentions _____ buildings.

    A. six    

    B. five  

    C. four      

    D. three

3. The writer introduces Washington in order of _____.

    A. population, history and culture  

    B. history and culture

    C. general introduction, history, sights and culture

    D. general introduction, history, sights, buildings and culture

下列属于商品的是 [ ]

①商场中待售的电冰箱 ②赠送同学的礼物 ③运往地震灾区的援助物资 ④家庭用的自来水

A．①②

B．②③

C．①④

D．③④

阅读下面的文字，根据要求作文。

有人在某次讲话中指出，当干部要有敬畏之心，敬畏历史，敬畏百姓，敬畏人生。其实，不仅是干部，我们每个人都需要对一些东西常怀敬畏之心，这样才能使我们内心充盈、宁静，并在行为上有所戒惧和节制，从而与外界形成良性互动关系。

以“常怀敬畏之心”为标题写一篇文章，立意自定，除诗歌外文体自选，不少于800字。

读京津唐工业区图，完成下列要求：

（1）该工业区主要的工业中心有：__________、__________、__________、__________、_________、

    __________、__________等。 

（2）依据图例中的工业部门性质，该工业区是一个__________性工业区。

（3）用简单的语言概括出下列表示京津唐工业区发展的有利条件（限30字以内）。

       京津唐地区依山面海，北连东北三省和内蒙古、南近陇海铁路沿线工业城市，地理位置优越。京津唐地区具有诸多发展工业的有利条件：区内有丰富的铁、煤和石油及多种农产品；以北京为中心向外辐射的铁路、公路、航空运输线都非常便捷，天津港和秦皇岛港是沿海的重要门户；北京、天津两直辖市科技力量雄厚。

（4）上述内容在图中已表示出来的有_____            _____、___          _______等。

肾病综合征的诊断标准是（）

A.大量蛋白尿（尿蛋白+++～++++，1周内3次，24h尿蛋白定量≥50mg/kg）

B.大量血尿（尿RBC＞30个/HP）

C.血浆白蛋白低于30g/L

D.血浆胆固醇高于5.7mmol/L

E.不同程度的水肿