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问题 单项选择题 B1型题

胸腔积液量约400ml（）

A.X线示肋膈角变钝

B.X线示大片状、边缘模糊阴影

C.X线示斑片状、边缘模糊阴影

D.X线示凸面指向肺内呈“D”字征阴影

E.X线示上缘呈向外侧升高的反抛物线阴影

答案

参考答案：A

解析：0.3～0.5L胸腔积液，X线下仅能显示肋膈角变钝，而不能出现其他表现。包裹性积液为积液多包裹在腋缘或靠后侧胸壁。当转动患者到切线位置时，可显示从胸壁向胸内凸出的半圆形或纺锤形均匀的浓密影，边缘锐。

单项选择题

A．关系、实体和属性

B．数据流、加工和数据有储

C．数据流、数据源和数据实体

D．数据流、属性、数据存储和加工
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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.
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