Price gouging is an unethical practice that exploits people in desperate situations by charging them exorbitant prices for essential goods and services. It is morally wrong and should be stopped. Governments should take steps to regulate prices and protect consumers from such unscrupulous activities...
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一、单选题（每小题2分，共20分） 1. 下列发电机中属于永磁发电机的是（ ） A. 直流发电机 B. 同步发电机 C. 永磁同步发电机 D. 永磁异步发电机 2. 当负荷较大时，下列哪种控制方法能够较好地保护电动机不过载运行（ ） A. 电流闭锁 B. 过流保护 C. 电压闭锁 D. 过载保护 3 .下列哪种不是常规的直流传动方式 （ ） A . 马达-减速器传动 B . 滚珠丝杆传动 C . 马弗栅传动 D . 直流无位置传感器直流传动 二、多选题（每小题3分，共15分） 4 .以下对定子绕组的说法正确的是 （ ﹖ ) A .定子一般采用三相四端子引出 B .定子一般采...<未完>点击进入
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At present, the most common fuel for a steam power plant is coal. Coal is the most widely used fuel in steam power plants due to its abundance and low cost. Coal-fired power plants produce electricity by burning coal in a boiler to produce steam. The steam is then used to drive a turbine which gener...<未完>点击进入
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