2022英语周报八年级新目标同步学案答案

10.BC【解析】小风扇消耗的电功率转化为机械功率和线圈上的热功率,因未说明小风扇的效率,所以不能计算小风扇的内阻,A项错误;根据变压器原、副线圈的匝数与电压的关系得n,=U=2=4,B项正确;吹热风时触片P与触点a、b接触,C项正确;若使用时发现该电吹风的电热丝发热但不吹风,则电源与电热丝为通路,小风扇不吹风,可能为原线圈断路,也可能是变压器副线圈和小风扇的回路开路所致,D项错误。

第一节One possible version:Dear Tony,Many thanks for your concern! Though Gaokao has been postponed due to theoverwhelming COVID-19, it is approaching day by day.Currently, I'm under unbearable pressure with endless tests to sit. I sometimes suffertest anxiety, which does upset me a lot. But what can't beat me can only serve to make mestronger. I'm positive that with adequate preparations, I'm getting closer and closer to mydream-to be a doctor to relieve pains of patients, which will motivate me to study harder.Best wishesYours,Li Hua

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