单选题If 1 2
单选题The use of growth-promoting antibiotics in hog
单选题For over two centuries, no one had been able to
单选题A computer equipped with signature-recognition
单选题Budget constraints have made police officials
单选题某电子设备厂生产的计算器有25％是不合格的，910不合格的计算器被检验出来后扔掉；并且有15合格的计算器被错误地扔掉。假设所有未扔掉的计算器都被出售，该电子设备厂出售的计算器中有百分之几是不合格的?
单选题Urban planner: When a city loses population due
单选题An “Armstrong number” is an n-digit number that is equal to the sum of the nth powers of its individual digits．For example，153 is an Armstrong number because it has 3 digits and 13+53+33=153．What is t
单选题There were 36，000 hardback copies of a certain novel sold before the paperback version was issued． From the time the first paperback copy was sold until the last copy of the novel was sold，9 times as
单选题Is ax＜a+x?10＜x＜12a is a positive integer.
单选题120的因子个数是多少?
单选题Platinum is a relatively rare metal vital to a
单选题Is n an integer?13n is an integer.22n is an integer.
单选题A $10 bill 1,000 cents was replaced with 50 coins having the same total value. The only coins used were 5-cent coins, 10-cent coins, 25-cent coins, and 50-cent coins. How many 5-cent coins were used?1
单选题A country’s per capita national debt is its national debt divided by its population．Is the per capita national debt of Country G within ＄5 of $500? 1 Country G’s national debt to the nearest S1，000，00
单选题Sandra saves the same amount of money each month in an account for her children future college expenses. Ten years from now, will Sandra have saved at least $12,000 more than she currently has in the
单选题Which of the following most logically completes
单选题If x is a positive integer, how many positive integers less than x are divisors of x ?1 x2 is divisible by exactly 4 positive integers less than x2. 2 2x is divisible by exactly 3 positive integers le