2022九年级英语周报第23期答案

写作Dear OliverKnowing that you are returning to your homeland, I am reluctant to saygoodbye to you.【高分句型一】(表达对Over的不舍之情)As for the gift, after careful consideration I recommend you the Chineseknot. Made of red threads, it always represents happiness, luck andunity, though in different shapes. It is a tradition for Chinese to hang it inhouses as a decoration,【高分句型二】 It is usually given as a precious gift toclose friends. I think it can convey your best wishes to your friend.(BF-种礼物并说明原因)Hope my advice can be of some help.(希里)Yours, Li Hua

10.(1)2cos o(2分)(3分)r-FR. R -Ratk(3)600(2分)(4)C(2分)(5)不变(3分)【解析】(1)对滑环受力分析,由平衡知识可知2Fcos=G,解得F=。G(2)由图乙可知R=kF十R,由图丙电路可知Ⅰ=EEtrX R. R Ri Ro k2(3)将k=0.59/N,O=60°,I=方lk=5mA,E=E3V,代入I=可得Gr R r, tr k-gr600N(4)当不挂重物时,电流表满偏,则重力零刻度线在电流表满刻度处,因G与Ⅰ不是线性关系,故刻度线不均匀,C项正确,A、B、D项错误。(5)实验前进行了步骤a操作,则r Rn R1 R,则当挂重物G时,rR RTR E k。G,则r不变,对实验的结果无影响,测量结果不变

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