学科网2023届高三下学期2月开学摸底考试文数

学科网2023届高三下学期2月开学摸底考试文数试卷答案,我们目前收集并整理关于学科网2023届高三下学期2月开学摸底考试文数得系列试题及其答案，更多试题答案请关注微信公众号：趣找答案/直接访问www.qzda.com(趣找答案)

学科网2023届高三下学期2月开学摸底考试文数试卷答案，以下是该试卷的部分内容或者是答案亦或者啥也没有

18.解:(1)连接AC,因为底面ABCD为正方形,所以AC⊥BD.又因为PA⊥平面ABCD,所以PA⊥BD又AC∩PA=A,所以BD⊥平面PAC因为AEC平面PAC,所以BD⊥AE(4分)PD(2)因为PA⊥平面ABCD,所以PA⊥CD,又因为底面ABCD是边长为2的正方形,所以CD⊥AD,又PA∩AD=A,所以CD⊥平面PAD.过点E作EH∥CD,则EH⊥平面PAD,(7分)又因为PE=2EC,所以EH=4,(8分)所以Vp=AED=VE-PD≈34△PADXEH=XADXPA×EH=×士×2×4X(12分)

1.C∵A=|x|x|<3}=|x|-3

8.B由题意,可分三类考虑(1)男生甲入选,女生乙不人选:CC+CC+C=31;(2)男生甲不入选,女生乙入选:CG+CC+C=34;(3)男生甲入选,女生乙入选:C+CC+〔路=21∴共有入选方法种数为31+34+21=86

41.B42.D43.C44.D45.A

第一节短文改错Im glad to know you were learning Chineseanguage and culture. In your last e-mail you said youwanted to know anything about my family spirits.Well, there are many good qualities that have Abeenpassed from generation to generation in my family. Mparents lay emphasis on the importance of honestbravery, perseverance and diligence and they have setgood example for me. My family spirits have anunbelievable profound influence on me. I'm friendly toablyothers but always ready to help others. I always cheerandup and never stop chase my goal even though I meetacross difficultiesithOwing to those good qualities, I have made tgreat progress in my study.