更多“当前公认的发达国家有20多个,其中美国、英国、德国、日本、法”相关的问题
机床工作运动是由()合成的。
A . 机床的主运动
B . 机床的辅助运动
C . 机床的退刀运动
D . 机床的上、下料运动
E . 机床的进给运动
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Listen to the passage three times and supply the missing words. (提示:每空四个单词) [音频] Once upon a time there was a little boy in Austria, known as Wolfgang who had a Papa, a Mama, ___1___Nannerl. Papa was a very good violinist. When his sister Nannerl was seven and Wolfgang was three, Papa started teaching her to play the piano. Wolfgang asked Papa to teach him, too. When the boy was four, Papa decided to ___2___. But he liked to play the violin like Papa. They got him a little violin One day Papa came home with two friends. They were going to play some new"trios" Wolfgang came into the room with his little violin and said, "Papa, can I play?" And his papa ___3____ and said, "Wolfgang, you can't play the violin. " But Wolfgang begged,"Please papa. Please, papa. The second violinist started feeling sorry for him and said to Wolfgangs Papa,"Let the little one ___4__ You won't be able to hear him play. Papa turned to Wolfgang and said, "All right, you can sit there and play, but make sure no one can hear you! Little Wolfgang sat down with his tiny violin and began to play. Soon the second violinist stopped playing. He looked at that____5____ who was now playing the second violin part all by himself!
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交磁电机扩大机中补偿绕组的并联电阻如出现短路故障,会导致加负载后电压()
A.下降
B.上升
C.保持不变
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如何做好成果示范()
A、制定示范计划
B、示范地点和示范户的确定
C、加强指导,创建高质量的示范样板
D、观察记载成果
E、组织观摩
F、撰写总结
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注册会计师应具备的下列各项能力或素质中,哪一项是胜任能力的核心()。
A.沟通能力
B.计算和分析能力
C.职业判断能力
D.职业道德
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在作业基准面()以上()为一般高处作业。
A.2米(不含2米)、30米以下(含30米)
B.2米(不含2米)、30米以下(不含30米)
C.2米(含2米)、30米以下(不含30米)
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下面错误不能用白盒测试技术发现的是()
A . 功能错误或遗漏
B . 界面错误
C . 程序分支错误
D . 性能错误
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料场规划的基本要求是( )。
A.料场规划应考虑充分利用永久和临时建筑物基础开挖的渣料
B.料场规划应对主要料场和备用料场分别加以考虑
C.在规划料场实际可开采总量时,应考虑料场查勘的精度、料场天然重度与坝体压实重度的差异,以及开挖运输、坝面清理、返工削坡等损失
D.料场规划中应先考虑料场的清理过程
E.料场规划应把所需的备料准备齐全和完整
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螺杆式压缩机属于无级压缩回转式压气机。
A . 正确
B . 错误
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短路电流计算的主要目的是()
\tA.选择新增断路器的额定断流容量;
\tB.提出今后发展新断路器的额定断流容量;
\tC.研究限制系统短路电流水平的措施;
\tD.保护装置选型。
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函数 在点( 处具有偏导数是它在该点存在全微分的
A. 必要而非充分条件 B. 充分而非必要条件 C. 充要条件 D. 既非充分又非必要条件
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1940年10月1日,江西省立实验幼稚师范学校——陈鹤琴出任校长,全面进行“活教育”实验,并创办《活教育》月刊,任主编。()
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在TCP/IP 体系结构中,ICMP 属于 ( ) 。
A.应用层
B.传输层
C.网络层
D.接口层
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类比是用发明创造的客体与某一事物进行类比对照,从而获得有益的启发,提供解决问题的线索。
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下列哪部分室壁由左右冠状动脉同时供血?
A.左室侧壁 B.左室后壁 C.左室前壁 D.室间隔后1/3 E.右心室大部分前壁
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