2023江苏省南通市海安市高三上学期期中考试地理答案

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2023江苏省南通市海安市高三上学期期中考试地理答案试卷答案，以下是该试卷的部分内容或者是答案亦或者啥也没有

14.(0,]【必备知识】本题考查的知识是“理解正弦函数在[0,2m上的性质(如单调性、最大值和最小值、图象与x轴的交点等)【关键能力】本题考查逻轷思维能力、运算求解能力【解题思路】先利用三角恒等变换化简∫(x),并求出其单满递增区间,再根据f(x)在(-a、a)(a>0)上单凋递增确定a的取值范玉【解析】f(x)=in2+30s1=2sin(+可),由-+2k2+3s2+2m(keZ),得-3+4≤x≤于+4∈7),所又a>0,所以a∈(0,」

17.【关键能力】本題考查逻辑思维能力、运算求解能力【解题思路】(1)cos∠BAC-sin∠BACc=3,a=4→sinC=正弦定理e·ADin∠BAD(2)BD=3DC-S△AHnBDb·ADsi∠CAD△4CD余弦定理→32=8b+b=26—△ABC的面积解:(1)因为c0∠BAC=1,所以sn∠BAC=1-c0s∠BAC=√-(})-32(2分)又a=42,c=3,所以由正弦定理可得inC=snht3x(4分)因为c

12.Bf()=sinr+4-L(os2-sin2)+cosr]=sinr+2sinx+2.设(x,y)是g(x)图象上的任意一点,它关于(0,-1)的对称点(-x,-2-y)必在f(x)的图象上,所以-2-y=sin2x2sinx+2,化简得sinr+2sinx-4即g(x)=-sin2x+2sinx-4,从而h(x)=-(+1)sin2x+(2-2)sinx-4-2令=如x(-≤≤t(=-(+1)2+(2-2)-4-2(1)当A=-1时,g()=4t-2是增函数;(2)当心>-1时要使q(D是增函数则≥解得一1<≤(3)当<-1时,要使q()是增函数则长≤一号,解得×<-1综上所述,≤

【解析】梯形ABCD旋转一周所围成几何体为圆台，且r=1,R=2,h=1.则=h2+R+R)=.选B.

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

11.B【解析】由(6-a)sin ab十sinB-sinC,得(b-a)sinA=(sinB-sinC)(b十c),由正弦定理,得(b-a)a=(b-c)(b+c),即a2+b2-c2=ab,由余弦定理,得cosC=a2+b2-c212ab2,又0