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在Word中，将文本转换为表格，该文本的每行之间必须用一个符号断开，这个符号不是（）
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CT检查，胆结石按密度分为________、_________和_________三种类型。
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典型克罗恩病的临床三联征是（）
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一台电脑由数以万计的人参与制造，他们当中大多数互不相识，让电脑得以形成的无数行为更没有任何人规定或指挥。从电脑的制造中可以看出（）。
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钢筋焊接接头的基本力学性能试验方法不包括（）。
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医疗机构的医务人员违反献血法规定，将不符合国家规定标准的血液用于患者的，可能承担下列法律责任，除了（）
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关于导尿描述错误的是（）
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当前我国主要的环境问题是什么?
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Shopping habits in the United States have changed greatly in the last quarter of the 20th century. （1） in the 1900s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was （2） on both sides with many （3） businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. （4）,some shops offered （5） .These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. （6） in the 1950s, a change began to （7） .Too many automobiles had crowded into Main Street （8） too few parking places were （9） shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces （10） the city limits. Open space is what their car-driving customers needed. And open space is what they got （11） the first shopping centre was built. Shopping centres, or rather malls, （12） as a collection of small new stores （13） crowded city centres. 14 by hundreds of free parking space, customers were drawn away from （14） areas to outlying malls. And the growing （16） of shopping centres led （17） to the building of bigger and betterstocked stores. （18） the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the （19） of one stop shopping, malls were transformed into landscaped parks, （20）benches, fountains, and outdoor entertainment. 请在17处填上正确答案（）
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焊接性试验