单选题If three water pipes A, B and C are working at the same time, they can fill a swimming pool in 6 hours, if only A and B work, it needs 8 hours to fill the swimming pool, in how many hours can C fill t
单选题When opened and lying flat, a birthday card is in the shape of a regular hexagon. The card must be folded in half along 1 of its diagonals before being placed in an envelope for mailing. Assuming that
单选题What is the sum of 3 consecutive integers? 1 The sum of the 3 integers is less than the greatest of the 3 integers。 2 Of the 3 integers，the ratio of the least to the greatest is 3．
单选题Each of the balls in a bag is red, or green, or blue. If one ball is to be removed at random, what’s the probability that the ball will be green?1There are 5 red balls and 4 blue balls in the bag.2The
单选题Given a positive number N, when N is rounded by a certain method for convenience, call it Method Y, the result is 10" if and only if n is an integer and 5×10n-1≤N5x10n. In a certain gas sample, there
单选题The annual stockholders’ report for Corporation X stated that profits were up 10 percent over the previous year，although profits as a percent of sales were down 10 percent．Total sales for that year we
单选题3×104 is greater than 4×103 by what percent?
单选题某个人在买价值500元书的时候，先首期付了100元，剩下的带利息的余款采用如下方式支付：连续30个月每月支付15元，最后再付10元，问最后所付利息是借款的百分之几?
单选题Which of the following most logically completes
单选题在一个由20个连续整数组成的递增数列中，前面10个整数的和为380，求数列中所有整数的和?
单选题Many leadership theories have provided evidence
单选题A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter．If the smaller rim makes X revolutions per second，how many revolutions per min
单选题下面哪个方程在坐标系中表示的直线只通过一个横坐标和纵坐标都为整数的点?
单选题On a certain number line, if 8 is distance of 18 from n, and 17 is he distance of 9 from n, then which of the following could be n?
单选题In the rectangular coordinate system, line k passes through the point n,-l. Is the slope of line k greater than zero?1 Line k passes through the origin. 2 Line k passes through the point 1 ,n + 2.
单选题After receiving numerous complaints from
单选题When the integer n is divided by 17，the quotient is x and the remainder is 5．When n is divided by 23，the quotient is y and the remainder is 14．Which of the following is true?
单选题在盒子1中有6个红球，4个白球；在盒子2中有3个白球，5个红球，问从这两个盒子中分别摸出1个都是白球的概率?
单选题Curator: If our museum lends Venus to the Hart