来源： 2598人已做 600难度 89.9%正确率
来源： 2328人已做 600难度 74.9%正确率
来源： 2309人已做 600难度 96.6%正确率
来源： 2277人已做 600难度 94.7%正确率
来源： 2276人已做 600难度 93.5%正确率
来源： 2306人已做 600难度 79.7%正确率
来源： 2375人已做 600难度 87.8%正确率
来源： 2306人已做 650难度 87.4%正确率
来源： 2365人已做 600难度 75%正确率
来源： 2340人已做 600难度 77.4%正确率
If the area of the triangle above is 35,what is the value of k?*此题无图，可跳过
If a and b are positive integers such that a – b and a/b are both even integers, which of the following must be an odd integer?
Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system’s ability to deal with all other pollutants.
More than 300 rivers drain into Siberia's Lake Baikal, which holds 20 percent of the world's fresh water, more than all the North American Great Lakes combined.
So dogged were Frances Perkins’ investigations of the garment industry, and her lobbying for wage and hour reform was persistent, Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to work within the government, rather than as a social worker.
Each of the students in a certain class received a single grade of P, F, or I. What percent of the students in the class were females? (1) Of those who received a P, 40 percent were females. (2) Of those who received either an F or I, 80 percent were males.
Given a positive number N, when N is rounded by a certain method (for convenience, call it Method Y), the result is if and only if n is an integer and .In a certain gas sample, there are, when rounded by Method Y, molecules of H2 and also molecules of O2. When rounded by Method Y. what is the combined number of H2 and O2 molecules in the gas sample?(1) The number of H2 molecules and the number of O2 molecules are each less than (2) The number of H2 molecules is more than twice the number of O2 molecules
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 less than 2x.
Officials at the United States Mint believe that the Sacagawea dollar coin will be used more as a substitute for four quarters rather than for the dollar bill because its weight, only 8.1 grams, is far less than four quarters, which weigh 5.67 grams each.
According to the passage, which of the following is probably true of the storage spaces mentioned in highlight ?