一电梯在10s内可将质量为1.5t的货物由楼房底层匀速运至四楼楼顶,若每层楼高3m,那么电梯的功率是多少千瓦?
The old man lived alone and _____ the age of 88, he _______ a cold winter morning.
1234567891011121314…20052006是( )位数.