更多“接触轨正线接触轨受流面在两相邻绝缘支架处相对高差不得大于（）”相关的问题
型号为SAlMg－1的焊丝是（)
A、铝铜焊丝B、铝镁焊丝C、铝锰焊丝D、铝硅焊丝
B、铝镁焊丝C、铝锰焊丝D、铝硅焊丝
C、铝锰焊丝D、铝硅焊丝
D、铝硅焊丝
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Happiness can be described as a positive mood and a pleasant state of mind. According to recent polls (民意测试), sixty to seventy percent of Americans consider themselves to be moderately happy and one in twenty persons feel very unhappy. Psychologists have been studying the factors that contribute to happiness. It is not predictable nor is a person in an apparently ideal situation necessarily happy. The ideal situation may have little to do with his actual feelings.A good education and income are usually considered necessary for happiness. Though both may contribute, they are only chief factors if the person is seriously undereducated or actually suffering from lack of physical needs.The rich are not likely to be happier than the middle-income group or even those with very low incomes. People with college educations are somewhat happier than those who did not graduate from high school, and it is believed that this is mainly because they have more opportunity to control their lives. Yet people with a high income and a college education may be less happy than those with the same income and no college education.Poor health does not rule out happiness except for the severely disabled or those in pain. Learning to cope with a health problem can contribute to happiness. Those with a good sex life are happier in general, but those who have a loving, affectionate relationship are happier than those who rely on sex alone. Love has a higher correlation with happiness than any other factor.It should be noted that people quickly get used to what they have, and they are happiest when they feel they are increasing their level no matter where it stands at a given time.Children whose parents were happily married have happier childhoods yet they are not necessarily happier adults when they grow up.The best formula for happiness is to be able to develop the ability to tolerate frustration, to have a personal involvement and commitment, and to develop self-confidence and self-esteem.
A．a happy childhoodB．great wealthC．a college degreeD．a feeling that conditions are becoming for the better
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干性皮肤应选择收敛性化妆水，可以舒展细碎皱纹，使皮肤绷紧使用皮肤测试仪，眼睛可以不盖棉片，但是皮肤必须清洁。()
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定时器/计数器用作定时器模式时,其计数脉冲由系统时钟信号12分频后提供,定时时间与定时器初值( )有关。
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蒸汽疏水器的故障可包括阀门无法关闭、阀门磨损、无法动作。
A.对 B.错
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调查资料的收集方法不包括（）。
A.医学检查和理化分析 B.观察和文献法 C.访谈法 D.自报法 E.自填问卷法
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抗生素治疗后多长时间对病情进行评价（）
A.72～96小时
B.48～72／小时
C.两周后
D.一周后
E.12～24小时
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某企业上年末资产负债表部分项目的余额如下：货币资金230000元，应收账款42450元，存货132000元，固定资产原价510000元，累计折旧183000元。该企业本年度发生下列经济业务： （1）购入A材料一批，买价为20000元，增值税额为3400元；购入B材料一批，买价为10000元，增值税额为1700元；购入A、B两种材料共发生运杂费900元，按材料的买价比例分配；材料的货款和运杂费共计36000元均以银行存款支付，材料已验收入库。 （2）对企业行政管理部门使用的固定资产计提折旧600元。 （3）销售产品一批，售价为30000元，增值税税率为17%，货款尚未收到；该批产品的生产成本为22000元，销售产品应交纳的城市维护建设税及教育费附加为500元。上述（1）、（2）、（3）各项业务发生后，应贷记的账户有（）。
A.累计折旧 B.物资采购 C.库存商品 D.主营业务收入
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关于计算机中使用的软件,以下说法中,错误的是( )。
A . 软件凝聚着专业人员的劳动成果B . 软件如同硬件一样,也是种商品C . 未经软件著作权人的同意复制其软件是侵权行为D . 软件与书籍一样,借来复制一下不损害他人
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城市轨道交通杂散电流的防护的方法有堵、排、（）三个方面。
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具有促进胰岛素作用及调节血糖的元素是
A．.铁
B．.铜
C．.铬
D．.锰
E．.锌
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下列说法中表述正确的是：_______
A、转基因食品是指利用生物技术改良的动物、植物和微生物所制造或生产的食品、食品原料及食品添加物等。
B、长期食用，不会对人体健康产生危害的食品称为无公害食品；广义的无公害食品包括有机食品、自然食品、生态食品、绿色食品、无污染食品等。
C、绿色食品是经过安全和营养双重质量检测的食品，所谓“绿色”就是环境保护的意思。
D、有机食品是指采取一种有机的耕作和加工方式生产和加工出的产品。
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下列哪项不是小脑共济失调的具体表现（）
A.辨距不良
B.姿势性震颤
C.轮替运动障碍
D.意向性震颤
E.抽搐
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