两个放在绝缘架上的相同金属球，相距r，球的半径比r小得多，带电量大小分别为q和3

改革开放以来，我国非公有制经济经历了一个从无到有、从小到大的发展过程。我国所有制改革的程度，与社会主义市场经济体制建立的程度和社会主义生产力发展的步伐是一致的。这反映了[ ]

①社会发展具有客观规律性

②社会存在的变化决定社会意识的变化

③经济基础决定上层建筑

④生产关系一定要适合生产力状况

A．①②

B．①④

C．②③

D．③④

ATS-L使用技术成熟的（）6速手自一体变速箱，完美匹配全球十佳发动机，使动力输出源源不断传递给车轮。

A.6L40

B.6T45

C.6L45

D.6T70

通过对所给材料的分析和理解，用200字左右的篇幅，简要提出强化农村文化建设的主要措施。　　要求：所提措施全面、可行、操作性强。

交流发电机的转速越高，端电压也（），输出电流也（）。说明转速对端电压的影响较大。

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.