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书面表达【参考范文】Dear fellow students,It worries me a lot to notice that lack of self-care broughtby academic pressure has greatly influenced the health of somestudents.Health is known as the first wealth.It is the basis of effi-cient studies and other activities.Therefore,I strongly advo-cate the idea of "manage our own health".To achieve thegoal,let's learn to strike a balance between study and rest bymeans of healthy eating,adequate rest and regular physical ac-tivities.Every small step counts!However busy we are,remem-ber to care for ourselves.Yours,Li Hua
【答案】AC(安融花昨殿独狼【解析】滑块到C点时速度最大,其所受合力为零,则有Fcos53°-mg=0,解得F-号mg,A正确,B错误;由能·64·配新教材d量的转化与守恒定律可知,拉力F做的功等于轻绳拉力对滑块做的功,滑轮与A间绳长L一sn37,滑轮与Cn53,滑轮右侧绳子增大的长度△L=L,-L2=d。一。dsin37一sin53-2,拉力做功W=FAL=d 5d2间绳长L2=6mgd,C正确,D错误。