2. 职称英语
  3. A researcher has found that the number of work hours needed to type in 5 words i

A researcher has found that the number of work hours needed to type in 5 words i

游客2024-01-12  59
问题 A researcher has found that the number of work hours needed to type in 5 words is directly proportional to the square root of s. If 2 work hours are needed to type in 2000 words, how many hours are needed to type in 4000 words?
选项 A、 
B、 
C、 
D、 
E、 
答案 A
解析 第一句话中有比例表达“directly proportional to”。定位成比例的两个数量为the number of work hours needed to type in s words(输入s个单词所需要的工作时间)和the square root of s()。设工作时间为t，比例为k，则转化为表达式t=。因为输入2000个单词需要2小时，所以2=，解得k=。则输入4000个单词需要的时间

选择A选项。
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