问题
单项选择题
地点车速用（）表示。
A、算术平均值
B、频率分布曲线
C、地点车速的算术平均值、速度频率分布曲线、累积频率分布曲线以及相应的数字参数
答案
参考答案：C
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地点车速用（）表示。
A、算术平均值
B、频率分布曲线
C、地点车速的算术平均值、速度频率分布曲线、累积频率分布曲线以及相应的数字参数
参考答案：C
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| Have you ever had to decide whether to go shopping or stay home and watch TV on a weekend? Now you 1 do both at the same time. Home shopping television networks (网络) have become a 2 for many people to shop without 3 having to leave their homes. Some shoppers are 4 of department stores and supermarkets- 5 the crowds, waiting in long lines, and sometimes 6 of finding anything they want to buy. They'd rather sit quietly at home in front of the TV set and 7 a friendly announcer describe a product 8 a model shows it. And they can 9 around the clock, buying something 10 by making a phone call. Department stores and even mail-under companies are 11 to join in the success of home shopping. Large department stores are busy 12 their own TV channels (频道) to encourage TV shopping in the future. 13 can ask questions about products and place 14 , all through their TV sets. Will shopping by television 15 take the place of shopping in stores? Some industry managers think so. 16 many people find shopping at a 17 store a great enjoyment. And for many shoppers, it is still important to 18 or try on dresses they want to buy. That's 19 specialists say that in the future, home shopping will 20 together with store shopping but will never entirely replace (取代) it. | ||||
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