八年级英语周报上册24期2019--2023答案

八年级英语周报上册24期2019--2023答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本站。

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

2(1)5.00mm(3分)(4)48(3分)(5)C(3分)【解析】(1)游标卡尺的主尺示数为5mm,游标尺的0刻线与主尺的刻线对齐,示数为0,则测量值为5mm+0×0.05mm=5.00mm。(4)取纸带上的AD段计算纸带运动的速度,有v(1.52+1.50+1.51)×10-23×0.02m/s=0.755m/s,该速度即为电动机转动的线速度,转轴边缘做匀速圆周运动,则0.755转速n2Rxd314×5×10r/s≈48r/(5)纸带与打点计时器的限位孔间存在摩擦使线速度测量值偏小,所以转速的计算结果也偏小,A错误;交流电的实际频率大于50Hz,则实际的时间间隔较小·所以实际的线速度较大,则实际的转速也较大.即测量结果偏小,B错误;细线有直径,在轴上绕行的过程相当于增大了转轴的直径,而上式仍按电动机原有直径进行计算,得到的计算值偏大,C正确;测量时的读数误差,可能使测量值偏大,也可能使测量值偏小,D错误。

以上就是八年级英语周报上册24期2019--2023答案，更多英语周报答案请关注本站。