皮皮学，免费搜题
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【简答题】
Chinese people tend to welcome healthcareproducts as the living standards improve. Theywould spend quite a large sumof money buyingenergy drinks, vitamin pills and beauty drinks. Thesehealth careproducts claim that they contain theantioxidants which could build bodies andslow aging.However, recent studies show that antioxidants may be just a medicalfairy tale. There is littledata supporting the use of antioxidants to protectagainst diseases. Experts say that to fightoxidative stress, people need to domore exercise and eat more fruits and vegetables.
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皮皮学刷刷变学霸
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【简答题】变频器的干扰有电源干扰、地线干扰、串扰、公共阻抗干扰等。尽量缩短电源线和地线是竭力避免( )。
【简答题】能量均分定理指出对于处在温度为T的平衡状态的经典系统，粒子能量中每一个平方项的平均值为 。
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