英语周报 202219 八年级 课标 5答案

3.A设物块B与斜面间的动摩擦因数为g,则 Mosin=/Mycos.当小球运动到最低点时,根据机械能守恒定律mg(L-Lc0)=mn,小球运动到最低点时,F一mg=m,解得F=(3-2c0)mg,根据题意,F=MgsnMeo解得=号A项正确

第一节Dear Mr GeorgeI am Li Hua, a volunteer of the activity"Englishi Communication to the Mountains". Now, I'm writing toexpress my sincere apology to you for not being present atthe activity to be held next Monday.The reason for my absence is that I suddenly fell illMy parents sent me to hospital, and I have to stay therefor a week. As for my volunteer work, I have asked myclassmate Tom to do it.Sincerely hoping that you can accept my apologiesYours.Li Hua

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