How _________ does Steven play? Three times a week.[ ]
A. long
B. old
C. often
答案:C
已知不等式ax2-3x+2>0的解集为{x|x<1或x>b}.
(1)求a、b的值;
(2)解关于x的不等式ax2+bn<(an+b)x.
超限运输车辆通过措施和加固措施有什么?