催化剂罐抽空器工作时，蒸汽进入喷射器中将（）。
A、热能变成动力能
B、动力能变成压力能
C、热能变成压力能
D、压力能变成动力能
参考答案：D
It was in the small house was built with stones by his father he spent his childhood.
A．it; that
B．that; where
C．that; that
D．that; which
液一液萃取时溶剂的选择要注意以下几点？
