单选题If x, y, and d are integers and d is odd, are both x and y divisible by d ?1 x + y is divisible by d. 2 x - y is divisible by d.
单选题Which of the following most logically completes
单选题在某个实验的结果中，-5出现5次，-4出现4次，-3出现3次，-2出现2次，-1出现1次，0出现1次，那么这个结果的median是多少?
单选题King School has an enrollment of 900 students. The school day consists of 6 class periods during which each class is taught by one teacher. There are 30 students per class. Each teacher teaches a clas
单选题A事件发生的概率是0.5，B事件发生的概率是0.3，AB同时发生的概率是0.1，问A不发生并且B不发生的概率?
单选题In parts of South America, vitamin-A deficiency
单选题Five numbers{1，2，3，4，5}are going to arranged in a row，if the odd numbers can not be arranged next to each other，问能够构成多少个5位数?
单选题If the numerator of a certain fraction is doubled and the denominator is decreased by 5, the new fraction is equivalent to 23. If the original fraction is equivalent to 27, What is the sum of the nume
单选题If n is an integer, is n15 an integer? 1 3n15 is an integer. 2 8n15 is an integer.
单选题数字2，3，4，5，6，7，0可以组成多少个两位数。
单选题求the mode of 0，0，1，1，3，3，3，4，5。
单选题How many hours were budgeted for a certain job?1The number of hours budgeted for the job plus the actual number of hours used for the job was 140.2 The actual number of hours used for the job minus th
单选题Jay: Of course there are many good reasons to
单选题某人从甲地至乙地，可以乘飞机和火车，假设飞机每日3班，火车每日4班，那么此人从甲地至乙地旅行一共有多少种不同的方式?
单选题A two-year study beginning in 1977 found that,
单选题Boreal owls range over a much larger area than
单选题某项工程A、B两队合作完成需要12天，B、C两队合作需要15天完成，A、C两队合作需要20天完成，如果由A、B、C三队合作需要多少天完成?
单选题How many people in Town X read neither the World newspaper nor the Globe newspaper?1 Of the 2，500 people in Town X，1，000 read no newspaper． 2 Of the people in Town X，700 read the Globe only and 600 re