英语周报 2018-2022 七年级37答案

9.(1)平衡摩擦力(2分)(2)0.565(2分)(3)变小(2分)不会(2分)(4)△v2-W(2分)(2分)【解析】(1)实验中轨道应倾斜一定角度,是利用木板的重力沿轨道斜向下的分力来平衡摩擦力。(2)根据游标卡尺的读数方法可得遮光条的宽度为0.5cm+13×0.05mm=0.5cm+0.065cm=0.565cm(4)释放木板前,设弹簧测力计的示数为F,根据受力平衡有2F1=mg释放木板的瞬间对木板有F′=Ma,对钩码有mg=F=m·2,则有F,、27个,所以F'

High school exit tests have been cancelled in some states in America in recent years. (=R-)This is notsurprising because studies show they do little good to students.【高分句型一】(要点二) nstead of ensuring college readiness and academic success, they actually don't measure what should be measure.【高分句型二】(要点三) Therefore, exit test scores should only be one part of the standards of high school diplomas.(要点四)[60 words

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