单选题一个正整数的映像可由颠倒其数字得到，比如321的映像是123，那么一个五位数字和其映像的差一定能够被下面哪一个整除?
单选题In setting environmental standards for industry
单选题一个矩形长宽分别为80，50，问两条边各增加多少时矩形面积是5400?
单选题A certain brand of house paint must be purchased either in quarts at $12 each or in gallons at $18 each．A painter needs a 3-gallon mixture of the paint consisting of 3 parts blue and 2 parts white．Wha
单选题Two dices each has six sides, which represent six values 1, 2, 3, 4, 5, 6 respectively. Cast the two dices and get two values, what is the probability of one value being 2 more than the other?
单选题A certain truck traveling at 55 miles per hour gets 4．5 miles per gallon of diesel fuel consumed．Traveling at 60 miles per hour，the truck gets only 3．5 miles per gallon．On a 500-mile trip，if the truck
单选题What is the first term of a sequence of consecutive odd integers of increasing value?1The range of the sequence is 14.2The sum of the sequence is 16.
单选题An investment has been growing at a fixed annual rate of 20% since it was first made; no portion of the investment has been withdrawn, and all interest has been reinvested. How much is the investment
单选题如果某个多边形P的内角和是平行四边形O内角和的5倍，那么多边形P一共有多少个顶点?
单选题What are all of the values of x that satisfy the equation x2-2x-3=0?
单选题Select 3 people from 4 couples to form a group. Two people of one couple can not be selected at the same time. How many ways of selection are there?
单选题How many integers between 1 and 2,000 will be the square of an integer and also be the cube of an integer?
单选题现在有1元人民币4张，2元人民币2张，10元人民币3张，从中至少取出1张，最多取出9张，共可以配成多少种钱数?
单选题Points -2, xandy, 2, not shown in the figure above, are in quadrants Ⅲ and Ⅱ, respectively, in which quadrant is pointx, y?
单选题Let’s be a set of outcomes and let A and B be events with outcomes in S．Let-B denote the set of all outcomes in S that are not in B and let PAdenote the probability that event A occurs．What is the val
单选题From 1900 until the 1930s, pellagra, a disease