A:what
B:that
C:how
D:Whatever
如图是探究物质吸热性能的实验装置,该实验要求水和煤油的____ 相同,搅拌器的作用是____ ,汽车发动机用循环水冷却的原因是____
—Oh, she's _______ mother. She's a teacher of our school.