更多“HXD3B型电力机车网侧电路中QF1代表的电气设备是（）。”相关的问题
比如一套手机模，2D和3D各需要多长时间完成？加工周期需多长时间？
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哲学系的逻辑学专业与数学系的数理逻辑专业没有关系
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左半结肠癌合并急性肠梗阻时，手术方法应是
A．局部肠段切除术
B．回肠直肠吻合术
C．癌近端肠管捷径术
D．先行横结肠造口术，以后再行左半结肠切除术
E．先行胃肠减压解除梗阻，然后再行左半结肠根治术
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进行直流电阻试验，应准确记录被试绕阻的温度，按规程规定的方法和要求及换算计算方法确定其被测时的温度下的电阻值。
A . 正确
B . 错误
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根据新的任务，有意识地、主动地把注意从一个对象或活动转移到另一个对象或活动上的现象叫作_______。
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影片《悲惨世界》中的歌曲《囚工之歌》在片中奠定了故事发生的背景基调并凸显了全片的（）意象。
A.喜剧
B.崇高
C.苦难
D.恐怖
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设有限长序列为 x(n) , N 1 ≤ n ≤ N 2 , 当 N 1 <0 , N 2 =0 时, Z 变换的收敛域为( ) ;
A. 0 ∞ B. |z|≥0 C. |z|< ∞ D. |z| ≤∞
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男性，66岁，慢支，肺气肿病史18年，近日呼吸困难加剧，咳嗽，咳痰。今日晨起一阵剧烈咳嗽后觉得喘憋加剧，无法平卧，胸痛剧烈，不敢呼吸。来诊，见其口唇发绀明显，表情痛苦，胸部叩诊呈鼓音行下列哪项检查可确诊（）
A . A.动脉血气分析
B . 血白细胞计数
C . 胸部X线摄片
D . 痰培养
E . 心电图检查
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影响纤维转移的因素有（）。
A.锡林与刺辊的速比
B.转移区的气流
C.针齿的规格
D.转移区的长度与隔距
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如此患者为高危险组，应采取的标准放疗方案为（）
患者女性，10岁，因“发作性头痛、眩晕、呕吐3个月，行走不稳”来诊。查体：意识清楚，言语较缓慢，双眼外展不及边，双眼侧视时有小幅度水平眼震。视盘水肿。共济失调。影像学提示：髓母细胞瘤可能性大。行手术切除肿瘤，拟行放射治疗。
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It has always been difficult for the philosopher or scientist to fit time into his view of the universe. Prior to Einsteinian physics, there was no truly adequate formulation of the relationship of time to the other forces in the universe, even though some empirical equations included time quantities. However, even the Einsteinian formulation is not perhaps totally adequate to the job of fitting time into the proper relationship with the other dimensions, as they are called, of space. The primary problem arises in relation to things which might be going faster than the speed of light, or have other strange properties. Examination of the Lorentz-Fitzgerald formulas yields the interesting speculation that if something did actually exceed the speed of light it would have its mass expressed as an imaginary number and would seem to be going backwards in time. The barrier to exceeding the speed of light is the apparent need to have an infinite quantity of mass moved at exactly the speed of light. If this situation could be leaped over in a large quantum jump—which seems highly unlikely for masses that are large in normal circumstances—then the other side may be achievable. The idea of going backwards in time is derived from the existence of a time vector that is negative , although just what this might mean to our senses in the unlikely circumstance of our experiencing this state cannot be conjectured. There have been, in fact, some observations of particle chambers which have led some scientists to speculate that a particle called the tachyon may exist with the trans-light properties we have just discussed. The difficulties of imagining and coping with these potential implications of our mathematical models points out the importance of studying alternative methods of notation for advanced physics. Professor Zuckerkandl, in his book Sound and Symbol, hypothesizes that it might be better to express the relationships found in quantum mechanics through the use of a notation derived from musical notations. To oversimplify greatly, he argues that music has always given time a special relationship to other factors or parameters or dimensions. Therefore, it might be a more useful language in which to express the relationships in physics where time again has a special role to play, and cannot be treated as just another dimension. The point of this, or any other alternative to the current methods of describing basic physical processes, is that time does not appear—either by common experience or sophisticated scientific understanding—to be the same sort of dimension or parameter as physical dimensions, and is deserving of completely special treatment, in a system of notation designed to accomplish that goal. One approach would be to consider time to be a field effect governed by the application of energy to mass—that is to say, by the interaction of different forms of energy, if you wish to keep in mind the equivalence of mass and energy. The movement of any normal sort of mass is bound to produce a field effect that we call positive time. An imaginary mass would produce a negative time field effect. This is not at variance with Einstein"s theories, since the "faster" a given mass moves the more energy was applied to it and the greater would be the field effect. The time effects predicted by Einstein and confirmed by experience are, it seems, consonant with this concept.
A．the music of the spheresB．music in the abstractC．musical notationD．the seemingly musical sounds produced by tachyons
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斯宾塞出版的第一部社会学专著是（）。
A . 《社会静力学》
B . 《社会学原理》
C . 《第一原理》
D . 《人与国家》
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400V母线用（）V摇表摇测绝缘，其绝缘电阻值不得低于（）兆欧。
A . 500V；1
B . 1000；1
C . 2500；1
D . 500；6
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食品安全国家标准GB7718-2011预包装食品标签通则，正式实施日期是（）
A.2011年6月1日
B.2011年12月1日
C.2012年4月20日
D.2012年9月1日
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