英语周报2018 -2022九上答案

第二节书面表aiting for you to explore. Besides, the exceptional PekingDear JackOpera performances there are also whatam so pleased to learn that you are to spertimerecommend you stay in Beijing, the capital and cul-cerelytural center of China. The city enjoys a high reputation forits abundance of ancient architecture, which represents thetraditional local lifestyles. And there

22.(1)3.115(3.112~3.118,2分)(M-t)d(2)mgL(2分)2(2分)【解析】(1)根据螺旋测微器的读数原理可知d=3mm+0.01×11.5mm=3.115mm(2)由于遮光条的宽度d很小,所以我们用很短时间内的平均速度代替瞬时速度。滑块通过B处光电门时的速度为v=4,滑块从A点运动到B点的过程中,钩码和带有遮光条的滑块组成的系统重力势能的减少量为△E1=mgL;系统动能的增加量为M+n)d△Ek=÷(M+m)h2r2

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