有4<5<9,故有2<5<3;
则a=2,b=5-2;
则a-1b=2-15-2=-5;
故答案为-5.
—Mr and Mrs White look so young.
—Yes. But they ______ for more than thirty years. [ ]
A. married
B. have married
C. had married
D. have been married
电机全悬挂的机车,JK00430机车走行部车载监测装置出现“44”报警时,表示的是()报警。
A、4轴空心轴
B、4刷端电机
C、4轴齿端电机
D、4轴刷端轴箱