单选题
单选题A．2xB．x2C．D．1
单选题
单选题函数y=x2-6x+8的单调减少区间是( )。A．(-∞，3)B．(-∞，-3]C．[-3，+∞)D．[3，+∞)
单选题
单选题
单选题
单选题设z=eysinx，则=()
单选题
单选题As the Cup Final was drawing closer, the injury of the best player was
a ______ for the whole team.
A. misdemeanor
B. mistrust
C. misfortune
D. mischief
单选题
单选题
单选题不等式(1+x)(1-|x|)＞0的解集为______
A.x＜1且x≠-1
B.x＜1且x≠-2
C.x＜1且x≠-3
D.x＜1
E.以上结论均不正确
单选题
单选题
单选题设f(x)为连续函数，且，则f(x)在x=2处有______。A．不可导B．f'(x)=2C．f'(x)=-2D．
单选题How many minutes will it take to completely fill a water tank with a capacity of 3,750 cubic feet if the water is being pumped into the tank at the rate of 800 cubic feet per minute and is being drained out of the tank at the rate of 300 cubic feet per minute? (A) 3 min. 36 see. (B) 6 minutes (C) 7 min. 30 sec. (D) 8 minutes (E) 1,875 minutes
单选题函数f(x)=x3-12x在闭区间[-3，3]上的最大值在点( )处取得． (A)x=-3 (B)x=3 (C)x=-2 (D)x=2
单选题一个长方体同一顶点的三个面的面积分别是，这个长方体对角线的长是()。
单选题已知a，b，c为三个连续奇数且a＜b＜c，它们均为质数，那么符合条件的a，b，c有______组．