题目内容
Assume 1990 to be the base year. If by the end of 2004 a country's export price index rose from 100 to 125 while its import price index rose from 100 to 125, its terms of trade would equal 100.
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The commodity terms of trade are found by dividing a country's import price index by its export price index.
For the commodity terms of trade to improve, a country's export price index must rise relative to its import price index over a given time period.
For the commodity terms of trade to improve, a country's imiport price index must rise relative to its export price index over a given time period.
数控机床通过互联网直接和机床生产厂家互通信息，发现并消除故障是（）
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