光伏电池主要分为（）；（）和化合物类和新概念类。
参考答案：晶硅类、薄膜类
热量通过直接接触的物体从温度较高的部位传递到温度较低的部位，叫热传导。
He decided that he would drive all the way home instead of _____ at a hotel for the night. [ ]
A. putting down
B. putting off
C. putting on
D. putting up
