英语周报2021-2022高一课标第57期答案

书面表达One possible versionI求Dear PeterI heve good news for you Our school Food Club will hold a dumpling- making activity. As you're interestedin Chinese food, I'm writing to invite you to join in the activity with me.As a kind of traditional Chinese food, dumplings are very popular during festivals, especially in the SpringFestival, when people will get together to make dumplings. The activity will begin at g am next Saturday in theschool canteen. First, (chefs) will teach us how to make dumplings step by step. Then, there will be a dumplingmaking competition in groups. Finally comes the most exciting part--enyoying our dumplings.Looking forward to your coming.Your

14.5x【解析】当三棱锥PBCM的体积最大时,平面PBM⊥平面BCM,取BC的中点D,PM的中点F,连接DM,过D作DE⊥平面BCM,当DE=MF时,E为三棱锥PBCM外接球的球心,DM=亏BC=1,DE=zPM=2,外接球半径r=PE=CEDB+DC-√x+1-2,所以三棱锥PBCM外接球的表面积为S=42=5x,

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