试题与答案

当电梯运行到顶层或底层时,仍不能停车,继续向上或向下运行,为防止电梯冲顶或蹾底造成事

题型:单项选择题

题目:

当电梯运行到顶层或底层时,仍不能停车,继续向上或向下运行,为防止电梯冲顶或蹾底造成事故,应在井道中设置()。

A.极限开关

B.越程开关

C.短站减速开关

D.限位开关

答案:

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No one could know how   38  I was when I took my violin to school for my first lesson. Several years later, I became famous as a violinist. And then, I carefully   39 the violin away.
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I said, "   43 dollars. "
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古希腊著名哲学家赫拉克利特有一句名言:“世界是包括一切的整体,它不是由任何神或被任何人创造的,它的过去、现在和将来都是按规律燃烧着,按规律熄灭着的永恒的活火。”赫拉克利特的这一思想被列宁评价为“对辩证唯物主义原则”的绝妙说明。这一评价说明,赫拉克利特[ ]

A、把唯物主义根本观点与朴素辩证法思想结合在一起

B、把唯物论和认识论科学地统一起来

C、是现代唯物主义的创始人

D、对世界的看法既唯物又辩证,因而是科学的

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