一种钢材 25 米重 120 吨，这种钢材平均每米重吨．

题干

一种钢材

2

5

米重 20

1

吨，这种钢材平均每米重（　　）吨．

A： $\frac{2}{5}$ × $\frac{1}{20}$

B： $\frac{2}{5}$ ÷ $\frac{1}{20}$

C： $\frac{1}{20}$ ÷ $\frac{2}{5}$

上一题下一题 0.0难度选择题更新时间:2018-09-30 10:14:02

C

	Population (million)	% of Income(收入) spent on food	Persons Per room	% of houses With water And electricity	Telephones per 100 people	% of children in High schools
Tokyo	28.7	18	0.9	100	44	97
Mexico City	19.4	41	1.9	94	6	62
New York	17.4	16	0.5	99	56	95
St.Paul	17.2	50	0.8	100	16	67
Osaka	16.8	18	0.6	98	42	97
Seoul	15.8	34	2.0	100	22	90
Moscow	13.2	33	1.3	100	39	100
Bombay	12.9	57	4.2	85	5	49
Calcutta	12.8	60	3.0	57	2	49
Buenos Aires	12.4	40	1.3	86	14	51
Los Angeles	11.5	12	0.5	94	35	90
London	11.0	24	0.6	100	50	58