Scientists Make Sweet
Discovery Good news for chocoholics:the treat preferred by millions all over the world is good for you,according to American researchers at the University of California.Chocolate contains substances called fla vonoids(类黄酮)that can help maintain a healthy heart and good circulation.The researchers have discovered that cocoa acts like aspirin and that eating a bar of chocolate once in a while may contribute to a healthy diet.Chocolate has also been shown to release endorphins(内啡肽)in the body:these chemicals help to reduce pain and stress and make you feel happy. But who first discovered this wonderful way of keeping healthy The Olmec Indians of Mexico and Central America were the first to grow cocoa beans,in about 1500 BC.and the Mayas were drinking un sweeten A. as a drink. B. as a gift. C. as food. D. as a medicine. [多选题]加氢裂化的氢耗来自( )
A.精制反应耗氢 B.裂化反应耗氢 C.设备漏损 D.溶解与低分油中的氢气 E.循环氢纯度低,进行置换。 F.外送氢 [单项选择]抱闸松闸时两侧闸瓦应同步离开,其四角处间隙平均值两侧各不大于()㎜.
A. 0.5 B. 0.6 C. 0.7 D. 0.8 [单项选择]胸骨角两侧通常与第几肋骨相连()
A. 1 B. 2 C. 3 D. 4 E. 5 [单项选择]下列关于钢索的安全系数叙述正确的是()。
A. 承载索<3.5、工作索<3.5 B. 承载索<1.5、工作索<2.5 C. 承载索≥2.5、工作索≥3.5 D. 承载索≥2.5、工作索≥2.5 [单选题]根据《中国人民共和国税收征收管理法实施细则》的规定,税务机关不能对 ( )实施检查。
A.纳税人的生产车间 B.纳税人的私人住宅 C.纳税人的经营场所 D.纳税人的货物存放地 [单项选择]下列房间的日照标准不准确的是( )。
A. 住宅应每户至少有一个居室能获得冬至日满窗不少于3h的日照 B. 宿舍应每层至少有半数以上的居室能获得冬至日满窗不少于1h的日照 C. 老年人公寓的主要居室应能获得冬至日满窗不少于3h的日照 D. 医院至少有半数以上的病房应能获得冬至日满窗不少于3h的日照 [判断题]执行管内传输设备维修作业计划不属于传输设备维护部门的主要职责。( )
A.正确 B.错误 [单选题] 属于职业技能鉴定前的组织准备工作是( )。
A.组织报名 B.试题准备 C.考场准备 D.人员准备 我来回答: 提交
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