8.计量单位
cent 美分 penny 一美分硬币 nickel 5美分硬币 dime 一角硬币 dozen 打 score 廿 Centigrade 摄氏 Fahrenheit 华氏 quart 夸脱 gallon 加仑 yard 码 meter 米 micron 微米 inch 英寸 foot 英尺 minute 分square measure 平方单位制 cubic meter 立方米 pint 品脱
基本规律
2 所有的质数都是奇数,但奇数不一定是质数
2 若ba,则b/a 若b
GRE中容易考到的统计题型主要就有以下七种
1. mode
一堆数中出现频率最高的一个或几个数e.g. mode of 1,1,1,2,3,0,0,0,5 is 1 and 0
2。range 一堆数中最大和最小数之差 e.g. range of 1,1,2,3,5 is 5-1=4
3。mean arithmatic mean
geometric mean n个数之积的n次方根
4。median
将一堆数排序之后,正中间的一个数, 或者中间两个数的平均数e.g. median of 1,7,4,9,2,5,8 is 5 median of 1,7,4,9,2,5 is /2=6
5。standard error
一堆数中,每个数与平均数的差的绝对值之和,除以这堆数的个数
e.g. standard error of 0,2,5,7,6 is: /5=2.4
6。standard variation
一堆数中,每个数与平均数之差的平方之和,再除以n e.g. standard variation of 0,2,5,7,6 is: _ 2 2 2 2 2_
|_ ++++_|/5=6.8
人教版英语八下Unit 9《Have you ever been to a museum》(Section A 3a)课文朗读
人教版英语八下Unit 9《Have you ever been to a museum》课件7
2014人教新目标英语八下unit 10《I’ve had this bike for three years》课件4
人教版英语八下Unit 9《Have you ever been to a museum》课件8
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b 3a-3b(含self check)课件
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b 1c课本听力素材(mp3)
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b 1b课本听力素材(mp3)
2014人教新目标英语八下unit 3《Could you please clean your room》section a 1b课本听力素材(mp3)
2014人教新目标英语八下unit 1《What’s the matter》period 4课件
2014人教新目标英语八下unit 10《I’ve had this bike for three years》课件1
2014人教新目标英语八下unit 1《What’s the matter》section b 1a-2e课件
2014人教新目标英语八下unit 1《What’s the matter》section a 2b课本听力素材(mp3)
人教版英语八下Unit 9《Have you ever been to a museum》课件包2
2014人教新目标英语八下unit 10《I’ve had this bike for three years》words单词听力朗读素材(mp3)
人教版英语八下Unit 9《Have you ever been to a museum》课件9
人教版英语八下Unit 9《Have you ever been to a museum》(Section A-1)课件
2014人教新目标英语八下unit 1《What’s the matter》section a 3a-4c(含grammar focus)课件
2014人教新目标英语八下unit 1《What’s the matter》section b 3a-3b(含self check)课件
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b2课件
人教版英语八下Unit 9《Have you ever been to a museum》(Section A 2d)课文朗读
2014人教新目标英语八下unit 1《What’s the matter》section a 2a课本听力素材(mp3)
2014人教新目标英语八下unit 1《What’s the matter》period 1课件
人教版英语八下Unit 9《Have you ever been to a museum》课件包1
2014人教新目标英语八下unit 1《What’s the matter》section a 1b课本听力素材(mp3)
2014人教新目标英语八下unit 1《What’s the matter》section a 1a-1c课件
2014人教新目标英语八下unit 1《What’s the matter》section a 2d课本听力素材(mp3)
2014人教新目标英语八下unit 1《What’s the matter》section b 1b课本听力素材(mp3)
人教版英语八下Unit 9《Have you ever been to a museum》(Section A-2)课件
2014人教新目标英语八下unit 1《What’s the matter》section b 2b课本听力素材(mp3)
2014人教新目标英语八下unit 10《I’ve had this bike for three years》课件
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