– Do you have a school trip?
– ___________
A:Yes, you do.
B:No, I do.
C:Yes, there is.
D:Sorry, I don’t know.
某物质的着火点为 t ℃,右上图中表示该物质燃烧得最旺的点是 ( )
你认为下列说法中正确的是( )
求: