判断题
超高温杀菌技术(简称UHT、)是利用热交换器或直接蒸汽加热,使食品在135~150℃温度下保持几秒或几十秒,加热杀菌后迅速冷却的杀菌方法。()
【参考答案】
正确
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营养繁殖是利用植物营养器官(根、茎、叶、芽等)的一部分为繁殖材料,在一定条件下人工培育成完整新植株。( )
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能引起植物病害的的生物称为病原物,真菌、病毒、寄生性种子植物、螨类都属于病原物。( )
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The statistics show the number of teens using tobacco has started to decline from record highs in 1997, so the mumber will stop distrubing.()
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To support the econmy, the United States Federal Reserve lowered interest rates.()
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The people with windfall tend to tell their closest friends and relatives and make their lives with visble changes.()
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From the gas stations and convenience stores, most middle school and high school smokers get their tobacco.()
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According to the national survey by the CDCOSH, we can know that less than 3 million kids between the ages of 12 and 17 are lighting up.()
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Bertelsen advises people to say nothing at all but can make some visible change of their lives.()
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More than a quarter of the winners were so scared of facing the disapproval of the greed of others that they seldom told a single other person about their windfall.()
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In USA.the legal age to buy tobacco is17.()
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