液压调速器长期存放时，要求是（）。
A．干存放
B．内部零件表面涂润滑脂存放
C．灌满调速器润滑油存放
D．灌满轻柴油存放
参考答案：D
They considered _____ a computer, which was considered _____ a great help in their work. [ ]
A. to buy; to be
B. buying; being
C. to buy; being
D. buying; to be
小红与小亮住在同一栋楼内，小红家住二楼，小亮家住四楼，他俩都从一楼开始上楼，小亮上楼的距离是小红的______倍．
