2022英语周报北大师版高一答案

19.AD通过图乙可知变压器原线圈两端电压的最大值为Um=100V.周期T=0.04s水磁体转动的角速度oT50rrad/s,所以T电压的瞬时值表达式为t=100sin50x(V),A正确;电压表V测量的是变压器原线圈两端电压的有50rrad/s,所以T电压的瞬时值表达式为t=100sin50x(V),A正确;电压表V1测量的是变压器原线圈两端电压的有效值,CU=50√2VB错误;电压表V测量的是理想变压器副线圈的输出电压,与有无负载无关,根据理想变压器原理得江=n,电压表v的示数U2=1002V,C错误;风速加倍时,角速度o加倍,根据E=mBSu可知产生的感应电动势加倍,变压器原线圈两端电压加倍,因此风速加倍时,变压器原线圈两端电压的瞬时值表达式为α=20osin10Or(V),D正确

NoticeMay I have your attention, please? I have anannouncement to make on behalf of our Students'Union. To arouse students' awareness of savingprecious food, our school is planning to hold a speechcontest entitled"Saving food, starting from me"in theschool hall. The exact time is scheduled at 2: 00 p.m.25th, OctoberEveryone including our teachers is welcomed totake an active part in the competition. The contents ofthe speech mainly involve in the importance of savingfood, how to save food and starting from ourselvesLooking forward to your active participationStudents'Union

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