更多“”相关的问题
醇在浓硫酸作用下加热脱水的反应历程是( )。
A. E1 B. E2 C. E1cb
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直通模式的简称是（）
A.DMO B.WAP C.API D.FTP
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新投入的变压器带负荷前应空载运行（）小时。
A.8
B.12
C.24
D.48
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女，32岁，多次血压测量，上肢血压130/80mmHg、下肢血压120/70mmHg，应考虑为
A．主动脉缩窄
B．主动脉瓣狭窄
C．正常人
D．主动脉瓣关闭不全
E．心包积液
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审计废旧物资出售废旧物资竞价合规性，可应用经法系统，查询各单位废旧物资处置合同及依据资料，然后在电子商务平台查询废旧物资处置；通过上述信息对比，查看是否存在私自处置及处置价格是否合规。
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下列有关电气防火措施的说法中，错误的有（）。
A.户内电压为11kV、总油量为75kg的充油设备，可安装在两侧有隔板的间隔内
B.总油量为350kg的充油设备，应安装在有防爆隔墙的间隔内
C.总油量为580kg的充油设备，应安装在单独的防爆间隔内
D.8kV的变、配电室应设在爆炸危险环境的正上方或正下方
E.变电室与各级爆炸危险环境毗连，最多只能有一面相连的墙与危险环境共用
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已知企业只生产一种产品，单位变动成本为每件45元，固定成本总额60,000元，产品单价为120元，为使
已知企业只生产一种产品，单位变动成本为每件45元，固定成本总额60,000元，产品单价为120元，为使安全边际率达到60%，该企业当期至少应销售的产品为() A、2000件 B、1333件 C、1800件 D、1280件
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利率底(interest rate floors)
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It is estimated that some seven hundred million people--about half of the world's population are unable to read and write, and there are probably two hundred and fifty million more people whose level of attainment is so slight that it barely outlives a literacy. Recently the attack on illiteracy (文盲) has been stepped up . A world plan has been drawn up by a committee of UNESCO experts in Paris, as part of the United Nations Development Decade, and an international conference on the subject has the aim. People must learn the basic skills of responsible citizenship: the ability to read notices, newspapers, timetables, letters, pricelists, to keep simple records and accounts, to sort out the significance of the information gathered, and to fill informs. The major areas of illiteracy are in Asia, Africa, and Central and South America. In Africathere are at least one hundred million illiterates, compromising(牵连) eighty to eighty-five per cent of the total population. In Europe the figure is about twenty-four million, most of them in Southern Europe, with Spain, Italy, Portugal, and Yugoslavia heading tl ,c list (the United Kingdom has about seven hundred thousand).Studying carefully the clues in the passage, we learn that the total population of Africa is ______.A．approximately seven hundred millionB．approximately one hundred and twenty-five millionC．approximately eight or eight point five thousand millionD．exactly twenty-four million
A.B.C.StudyingD.A．approximatelyE.approximatelyF.approximatelyG.exactly
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患者，男，41岁。十二指肠溃疡史，除有空腹痛进食后缓解外，突然发生呕吐，所吐物为昨天吃的食物。引发原因是
A．食管炎
B．急性胃炎
C．胆石症
D．幽门梗阻
E．急性胰腺炎
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当需拉开钢轨调整轨缝时，要在拉开的轨缝间预先装设临时连接线。临时连接线的长度应使钢轨接头可能拉开200mm。
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耐磨性是精密导轨设计的基本要求之一，这句话正确与否()
A.不正确
B.无法判断
C.其他
D.正确
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水能扑救下列哪种火灾？（）
A.石油、汽油
B.熔化的铁水、钢水
C.高压电器设备
D.木材、纸张
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