电压与电流成正比例关系，比例系数称为元件的。（填中文）
查看答案
In this part, you are going to hear five sentences. Listen and write down what you have heard in the given area.[音频]
[音频]Listen to the recording and write down what you have heard in the answer area.
对于需求缺乏弹性的商品,提高价格会使厂商销售收入增加。
A. 对
B. 错
微信支付 
支付宝支付