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最佳答案：a nitrate-containing compound 一种含硝酸盐的化合物a selenium-containing compound 一种含硒的化合物
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最佳答案：Highly effective calcium不好,这里的“高效”是“高效能”的意思,形容词应该用efficent,名词用efficiency.effecti
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最佳答案：add up all the numbers and you will know the resultwe tried hard to make him cal
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最佳答案：Note the results of the numerical value measurement play a multimeter direct,pre
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最佳答案：It is not the network's fault that the youth are addicted to the network.The res
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最佳答案：in order to get an accurate result,he checked the data carefully.we came to a fa