A:有极大值,无极小值
B:有极小值,无极大值
C:既有极大值又有极小值
D:既无极大值也无极小值
—The Dragon Boat Festival is coming. I'm going to give a talk about it to the exchange students.
— Great! But don't forget to tell them _________.
如图是实验室制取纯净、干燥的二氧化碳气体,并探究其某些性质的实验装置.据图回答下列问题: