2022 英语周报 高二 课标 50cqy答案

18.【解析】(1)证明:连接BQ,由题意知PD⊥平面BMQN,所以BQ⊥PD,生正2分因为在△PBD中,BD=PB=PD=22,所以Q为PD的中点,…因为PE=3ED,所以DE=40D=PD=DE=0=PD=+m=0=+03分即QE=ED5分因为B0=OD,所以OE∥BQ,…6分因为OE平面BMQN,所以OE∥平面BMQNPC+PD2-CD2_(22)2+(222)-4(2)在△PCD中,cos∠CPD=2×22×22在Rt△PNQ中,∠NQP=,cos∠QPN=所以PN=CN=PC-PN=7分即点N为线段PC上靠近C的三等分点以O为原点,建立如图所示的空间直角坐标系则0(0,0,0),A(0,-2,0),B(2,0,0),C(0,2,0),D(-2,.0,0),P(0,0,6),分(-2=(-2,-236)48=(,2,0A=(0,设平面PAB的法向量为n=(x,y,z),=0则取z=1,n=(3,-3,1)10分√2取z=1,n=(3,-3,1)……10分y+√6z=0设直线NQ与平面PAB所成角为6则0=1c0,m>}=m0。6…11分综上,直线M0与平面PAB所成角的正弦值为点12分

、写作(共两节,满分35分)第一节短文改错(共10小题;每小题1分,满分10分)Last Saturday, my classmates and I went to the Chinese Academy of Sciences, what was aprecious chance to get closely to science. The moment whan we arrived there, we were warmlygreeted by an expert stood at the entrance. To have A better understanding of daily basic science,standingwe first attend a professional lecture on the theme of life and Water. The highlight of the visitattendedvere the hands-on experience in the science lab Under the guidances of the expert, we gotinvolved in a medical experiment with great enthusiasm Through the meaningful activity we allagree science plays an important role in our life. We are determining to study hard to understanddeterminedthem

以上就是2022 英语周报 高二 课标 50cqy答案，更多英语周报答案请关注本网站。