若在关联方向下，功率P>0，说明该元件在消耗能量。
查看答案
元件的性质（比如耗能特性）与参考方向有关。
A. 对
B. 错
电流方向表示方法有：剪头法、双下标法、正负极性法。
A. 对
B. 错
关联方向下，欧姆定律为U=IR。
A. 对
B. 错
In this unit, you may meet some particular terms commonly used when people talk about distribution channels. Now, check the following words and expressions and match them with their meanings.
微信支付 
支付宝支付