大化改新时，废除世袭贵族统治制度的主要目的是 [ ]
A、建立中央集权体制
B、提高政府办事效率
C、精简政府办事人员
D、维护奴隶主利益
答案：A
— I called you at about half past eight last night,but nobody answered.
— Oh, I in my office at that time. [ ]
A. will work
B. was working
C. worked
D. had worked
同压力弹簧离合器相比，膜片弹簧离合器有（）优点。
A.维修方便
B.踏板力较小
C.工作方式简便
D.无离合器间隙
