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电阻的国际单位是。（填中文）

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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

如果两种商品具有替代关系，则相应的需求交叉价格弹性系数为负值。

A. 对
B. 错