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65、他励直流电动机降低电源电压调速与减小磁通调速都可以做到无级调速。
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  • 名词解释 具体政策公共政策
  • 提出“趣味教育”的是( )。 A、 王国维 B、 梁启超 C、 鲁迅 D、 蔡元培创业设计与实务
  • SN1反应是立体专一的反应,按照背面取代的机理进行,在反应的位点发生了构型翻转。错误正确有机化学(药学专)
  • Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire.It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒). Which title best fits the passage? 大学英语(三)
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  • 6[多选题] 以下哪一种情况是企业会支付效率工资的原因的例子?(ABCD) A. 在均衡工资时,工人往往离职去找更好的工作  B. 在均衡工资时,当老板看不见时工人就睡觉,因为工人并不十分担心被解雇  C. 在均衡工资时,只有素质最差的申请工作。  D. 在均衡工资时,公认负担不起充分的营养,因此,在工作时由于能量不足而睡觉。 A.在均衡工资时,工人往往离职去找更好的工作 B.在均衡工资时,当老板看不见时工人就睡觉,因为工人并不十分担心被解雇 C.在均衡工资时,只有素质最差的申请工作 D.在均衡工资时,公认负担不起充分的营养,因此,在工作时由于能量不足而睡觉。河南理工大学