加热炉按炉内传热方式分为三类：（）式；（）式；辐射对流式。
参考答案：辐射；对流
_____ is not only what you do, but also how you do it that makes the difference.
A．There
B．This
C．That
D．It
发电机G60保护装置由哪些保护组成？
