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风口前理论燃烧温度与炉缸温度有什么区别，哪些因素影响理论燃烧温度？

答案

参考答案：

理论燃烧温度指的是煤气的原始温度，而炉缸温度指的是炉渣和铁水的温度。

影响理论燃烧温度的因素有：

①风温↑，T理↑；

②富氧↑，T理↑；

③燃料喷吹量↑，T理↓

单项选择题

人行道宽度由()确定。

A．步行交通需要的宽度

B．路幅宽度和步行交通需要的宽度

C．步行交通需要的宽度和地下管线和绿化布置与人行道宽度的关系

D．路幅宽度及地下管线和绿化布置与人行道宽度的关系
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单项选择题 案例分析题

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 betterstocked 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（）

A.on

B.in turn

C.by turns

D.further
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