水封阀的基本要求为水封的封止有效高度应符合规程要求，即为煤气计算压力至少加（）mm。

2010年5月7日，国务院出台鼓励和引导民间投资健康发展“新36条”意见。鼓励和引导民间资本进入基础产业、基础设施、市政公用事业、政策性住房建设、社会事业、金融服务、商贸流通和国防科技工业领域，鼓励和引导民间资本重组联合和参与国有企业改革，推动民营企业加强自主创新和转型升级，支持民营企业参与国家重大科技计划项目和技术攻关，鼓励和引导民营企业积极参与国际竞争，并为民间投资创造良好环境，加强对民间投资的服务、指导和规范管理。7月22日，国务院进一步出台细则，将“新36条” 40项目划责到部委，由20多个部委共同分工落实。

（1）运用经济学常识，说明国务院重视鼓励和引导民营企业发展的依据。

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（2）“新36条”意见对于建立和完善社会主义市场经济体制有什么重要性？

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根据运输业的特殊性，运输成本可以划分为固定设施成本、运营成本和（）。

A.机会成本

B.沉没成本

C.边际成本

D.移动设备拥有成本

行政合同行为是通过契约的方式将国家所要达到的行政管理目标（），并在合同中规范双方当事人的权利和义务。

A、固定化

B、合理化

C、法律化

D、程序化

预防犯罪工作的主要措施有（）。

A、思想教育、政治考核

B、管理控制、心理疏导

C、矛盾化解、技术防范

D、法纪教育

The United States counts its population every ten years, and each census reveals that the racial and ethnic mix is changing dramatically, so by the year 2050, the "average" American will not be descended from (1) , but the majority of U. S. residents will trace (2) ancestry to Africa, Asia, the Hispanic world, the Pacific Islands, or the Middle East. Once the United States was a microcosm of European nationalities, (3) the United States is a microcosm of the world. The United States is (4) considered a "melting pot" society by many of its residents. (5) , many people prefer the term "salad bowl." They use this (6) to describe American society. American society will soon be (7) nonwhite. "Melting pot" implies that the different ethnic groups blend together (8) one homogeneous (9) , "salad bowl" (10) that nationalities, like the ingredients in a mixed green salad, retain their cultural (11) . Earlier generations of (12) believed they had to learn English quickly not only to survive but also for (13) .
Now, many immigrant groups do not (14) the same need. Because there are many places in America (15) you can work, shop, get medical care, marry, divorce and die without knowing English. (16) , Chinatown in San Francisco and New York. Also, Los Angeles has many Vietnamese immigrants and immigrants from Mexico. (17) , many immigrant groups want their children to know their (18) culture. Many Hispanics, for instance, want their children to learn (19) English and Spanish and study the Spanish language in school. They are fighting for the (20) to bilingual education in many communities. In many communities they are in the majority.