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影响大肠杆菌系统外源基因表达的因素有哪些？
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下列化合物哪一个不是胆色素（）。
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网上银行的定义：
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集中表现概念间的定量关系和变化趋势的表达方式是：
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开采易自燃煤层时，采煤工作面最好的通风方式是（）。
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男性，48岁，原有乙型肝炎，2周前出现肾病综合征表现就诊。体检：血压22／13kPa（165／98mmHg），肝脾未及，腹水（+）。化验：尿液检查蛋白（++++），红细胞10～15／HP，白细胞0～2／HP，24h尿蛋白4．0g，非选择性蛋白尿，补体及肾功能正常。未发现恶性肿瘤证据。若行肾穿刺活检最可能呈现的病理特点是（）
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LTE的主要接口有：（）
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ElGamal公钥加密体制的基础是以下哪一个数学问题？（）
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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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关于中国教育科研计算机网（CERNET），下列说法不正确的是（）。