滤油器的进、出口压差随着滤芯的堵塞而()。
A、减小
B、不变
C、增大
参考答案:C
I wonder what will my daughter if she failed most people have succeeded.
A.turn to ; in which
B.become of ; where
C.turn out ; that
D.become in ; when
真空煮晶锅的结晶过程是下列哪种原理()
A.采用降温来降低溶解度使溶液进入过饱和区结晶
B.采用调pH到等电点来降低物料溶解度至过饱和区结晶
C.蒸发溶剂,使浓缩溶液进入过饱和区起晶
D.以上皆非