液压千斤顶实际上是利用液压油作为工作介质的一种能量转换装置。( )
参考答案：对
Many of us would agree that improving country through technology has great potentials ______ food
development in China. [ ]
A. in terms of
B. regardless of
C. in spite of
D. on account of
减压塔在塔顶馏出线上设置抽真空系统，采用（）将塔内气体抽出，造成塔顶的真空度
A、蒸汽喷射泵
B、塔顶空冷
C、引风机
D、机械真空泵
