2023年普通高等学校招生全国统一考试·金卷(二)2地理答案

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Ladies and gentlemen,It is a great privilege for me to deliver a speech here.When it comes to my hero,the first name popping intomy head is Yuan Longping,Father of Hybrid Rice.What inspires me most is his perseverance.Dr.Yuan initially found it hard to study the new rice under thetough condition in the 1950s,but he still devoted his youth to it.And even at the age of 90,he strove to extendhis research to sea rice.Such spirit constantly stimulates me to keep moving,regardless of how many exams Ifailed.Thanks for your attention!

ra,a≤b,注：max{a,b}=aa≥bmin(a,b)=b,a b.解：(1)记“选派的4人中恰有2人来自部门C”为事件A,则P(A)=CC号3C。7(2)由题设得：的所有可能取值为1,2,3,4，CiC]C+CICCA1263P(E=1)=Cio2105P(E=2)=CCA+C号C453Cto21014'P(=3)=C:CJA+CAC)3819Cio210105'P(E=4)=C1210,所以：的分布列为123435高191P105210Ee)-1+2x是+3×品+431167210105