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苹果酸
学名羟基丁二酸,分子式HOOCCHOHCH2COOH。广泛存在于未成熟的水果如苹果、葡萄、樱桃、菠萝、番茄中。
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malic acid
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quadratic deviation
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quadratic differential
quadratic discriminatory analysis
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quadratic dual problem
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