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题目:
选择题
按照成本性质,旅游企业成本可划分为:
- A. 固定成本 变动成本
- B. 直接成本
- C. 漏洞成本
- D. 间接成本
答案:
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有一电除尘器烟气在电场中的平均流速时1.5m/s,其电场长度为15M,其烟气在电场中停留()S。
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机组启动冲车后应严密关闭()。
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瘀血的概念是什么?
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流体的静压强具有()特性。
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基因克隆是基因工程的核心.
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用隔离开关可以直接拉合( )
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用比例换向阀可实现液压缸()调节。
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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11处填上正确答案()
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人类所特有的区别于动物的特点是( )。
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在交换网络中,网元MSC一般和下列网元()合设。