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
