百校大联考全国百所名校2022届高三大联考调研试卷三英语答案

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19.AC【解析】本题考查交变电流,目的是考查学生的推理能力。电压互感器原线圈匝数较多,是一种降压变压器选项A正确;电压互感器的工作原理是电磁感应中的互感现象,不能测量稳恒直流电压,选项B错误;电压互感器不能改变电流的频率,只能改变电压,其原、副线圈电流的频率相同,选项C正确;因为电压互感器原线圈匝数较多,所以副线圈的电流大于原线圈的电流,选项D错误。

【考范文】Dear fellow studentsWith the cold and flu season colliding (Rzi) with the COVID. 19 pandemic, how to protect ourselves ismailer of urgency. To combat the flu and other illnesses this season, all students had better do as followsThe single best way to prevent seasonal flu is to get vaccinated, but good health habits like avoidingpeople who are sick, covering your cough and washing your hands of ten can help stop the spread of germsadditionally, it's strongly advised to get enough sleep and reduce stress, which is also of great help.It's high time that we took preventive measures to ensure a sound body and a happy lifeStudent Union