隔板反应是常用的一种水力搅拌反应设备，有（）和（）在两种。
参考答案：往复式；回转式
---Why do you come back so late?
---Because there were too many people in the supermarket, and I had to _____to pay for the things.
A．wait in line
B．cut in line
C．stand up
D．speak loudly
某款微波炉带电脑控制装置、烤盘和双层烤架。这些（）使它成为高档微波炉。
A.产品种类
B.产品形式
C.产品效用
D.产品属性
