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試卷第=page11頁,共=sectionpages33頁試卷第=page11頁,共=sectionpages33頁第8課函數(shù)的奇偶性及周期性學(xué)校:___________姓名:___________班級:___________考號:___________【基礎(chǔ)鞏固】1.(2022·湖南·長沙一中模擬預(yù)測)已知SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),且
SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】SKIPIF1<0,SKIPIF1<0是周期為SKIPIF1<0的函數(shù)SKIPIF1<0又SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù)SKIPIF1<0當(dāng)SKIPIF1<0時,SKIPIF1<0SKIPIF1<0故選:A2.(2022·重慶南開中學(xué)模擬預(yù)測)函數(shù)SKIPIF1<0的圖像大致為(
)A. B.C. D.【答案】A【解析】解:SKIPIF1<0的定義域為SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0為奇函數(shù),排除CD選項.當(dāng)SKIPIF1<0時,SKIPIF1<0,SKIPIF1<0,由此排除B選項.故選:A3.(2022·海南??凇ざ#┮阎瘮?shù)SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),函數(shù)SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱,若SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】因為SKIPIF1<0的圖象關(guān)于SKIPIF1<0對稱,則SKIPIF1<0是偶函數(shù),SKIPIF1<0,且SKIPIF1<0,所以,SKIPIF1<0對任意的SKIPIF1<0恒成立,所以,SKIPIF1<0,因為SKIPIF1<0且SKIPIF1<0為奇函數(shù),所以,SKIPIF1<0,因此,SKIPIF1<0.故選:B.4.(2022·江蘇江蘇·二模)已知SKIPIF1<0是定義域為R的偶函數(shù),f(5.5)=2,g(x)=(x-1)SKIPIF1<0.若g(x+1)是偶函數(shù),則SKIPIF1<0=(
)A.-3 B.-2 C.2 D.3【答案】D【解析】SKIPIF1<0為偶函數(shù),則SKIPIF1<0關(guān)于SKIPIF1<0對稱,即SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0關(guān)于SKIPIF1<0對稱,又f(x)是定義域為R的偶函數(shù),∴SKIPIF1<0,∴f(x-4)=f[(x-2)-2]=-f(x-2)=-[-f(x)]=f(x),即f(x-4)=f(x),SKIPIF1<0周期為SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0.故選:D.5.(2022·湖南·雅禮中學(xué)二模)函數(shù)SKIPIF1<0的定義域為SKIPIF1<0,若SKIPIF1<0是奇函數(shù),SKIPIF1<0是偶函數(shù),則(
)A.SKIPIF1<0是奇函數(shù) B.SKIPIF1<0是偶函數(shù)C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】因為SKIPIF1<0是奇函數(shù),∴SKIPIF1<0,∵SKIPIF1<0是偶函數(shù),∴SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,即周期為8;另一方面SKIPIF1<0,∴SKIPIF1<0,即SKIPIF1<0是偶函數(shù).故選:B.6.(2022·遼寧·撫順市第二中學(xué)三模)函數(shù)SKIPIF1<0是R上的奇函數(shù),函數(shù)SKIPIF1<0圖像與函數(shù)SKIPIF1<0關(guān)于SKIPIF1<0對稱,則SKIPIF1<0(
)A.0 B.-1 C.2 D.1【答案】C【解析】函數(shù)SKIPIF1<0是R上的奇函數(shù),則SKIPIF1<0設(shè)SKIPIF1<0,則SKIPIF1<0,則函數(shù)SKIPIF1<0的圖像關(guān)于點SKIPIF1<0對稱函數(shù)SKIPIF1<0圖像與函數(shù)SKIPIF1<0關(guān)于SKIPIF1<0對稱,所以函數(shù)SKIPIF1<0的圖像關(guān)于SKIPIF1<0對稱,所以SKIPIF1<0故選:C7.(2022·重慶八中模擬預(yù)測)定義域為SKIPIF1<0的偶函數(shù)SKIPIF1<0,滿足SKIPIF1<0.設(shè)SKIPIF1<0,若SKIPIF1<0是偶函數(shù),則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.2021 D.2022【答案】C【解析】∵SKIPIF1<0,∴SKIPIF1<0,又SKIPIF1<0為偶函數(shù),∴SKIPIF1<0,即SKIPIF1<0,∴SKIPIF1<0,又SKIPIF1<0是定義域為R偶函數(shù),∴SKIPIF1<0,∴SKIPIF1<0周期為4,又SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0.故選:C.8.(2022·湖北·華中師大一附中模擬預(yù)測)已知定義在D的上函數(shù)SKIPIF1<0滿足下列條件:①函數(shù)SKIPIF1<0為偶函數(shù),②存在SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上為單調(diào)函數(shù).則函數(shù)SKIPIF1<0可以是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】對于A,SKIPIF1<0定義域為SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0為奇函數(shù),A不是;對于B,SKIPIF1<0定義域為R,由SKIPIF1<0得SKIPIF1<0,即對任意的正整數(shù)k,SKIPIF1<0都是SKIPIF1<0的零點,顯然不能滿足條件②,B不是;對于C,SKIPIF1<0,必有SKIPIF1<0,則SKIPIF1<0且SKIPIF1<0,即SKIPIF1<0定義域為SKIPIF1<0且SKIPIF1<0,SKIPIF1<0,則函數(shù)SKIPIF1<0為偶函數(shù),滿足條件①,設(shè)SKIPIF1<0,其導(dǎo)數(shù)SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,令SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,即SKIPIF1<0在SKIPIF1<0上為增函數(shù),而SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上為減函數(shù),因此SKIPIF1<0在SKIPIF1<0上為減函數(shù),即存在SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上為減函數(shù),滿足條件②,C是;對于D,SKIPIF1<0定義域為SKIPIF1<0,不能滿足條件②,D不是.故選:C9.(多選)(2022·遼寧沈陽·三模)已知SKIPIF1<0分別是定義在R上的奇函數(shù)和偶函數(shù),且SKIPIF1<0,則下列說法正確的有(
)A.SKIPIF1<0 B.SKIPIF1<0在SKIPIF1<0上單調(diào)遞減C.SKIPIF1<0關(guān)于直線SKIPIF1<0對稱 D.SKIPIF1<0的最小值為1【答案】ACD【解析】由題,將SKIPIF1<0代入SKIPIF1<0得SKIPIF1<0,因為SKIPIF1<0分別是定義在R上的奇函數(shù)和偶函數(shù),所以可得SKIPIF1<0,將該式與題干中原式聯(lián)立可得SKIPIF1<0.對于A:SKIPIF1<0,故A正確;對于B:由SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0不可能在在SKIPIF1<0上單調(diào)遞減,故B錯誤;對于C:SKIPIF1<0為偶函數(shù),關(guān)于SKIPIF1<0軸對稱,SKIPIF1<0表示SKIPIF1<0向右平移1101個單位,故SKIPIF1<0關(guān)于SKIPIF1<0對稱,故C正確;對于D:根據(jù)基本不等式SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時取等,故D正確.故選:ACD10.(多選)(2022·廣東·潮州市瓷都中學(xué)三模)定義在SKIPIF1<0上的偶函數(shù)SKIPIF1<0滿足SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,設(shè)函數(shù)SKIPIF1<0,則正確的是(
)A.函數(shù)SKIPIF1<0圖像關(guān)于直線SKIPIF1<0對稱 B.函數(shù)SKIPIF1<0的周期為6C.SKIPIF1<0 D.SKIPIF1<0和SKIPIF1<0的圖像所有交點橫坐標(biāo)之和等于8【答案】AD【解析】SKIPIF1<0,SKIPIF1<0函數(shù)SKIPIF1<0圖像關(guān)于直線SKIPIF1<0對稱,故A正確;又SKIPIF1<0為偶函數(shù),SKIPIF1<0,所以函數(shù)SKIPIF1<0的周期為4,故B錯誤;由周期性和對稱性可知,SKIPIF1<0,故C錯誤;做出SKIPIF1<0與SKIPIF1<0的圖像,如下:由圖可知,當(dāng)SKIPIF1<0時,SKIPIF1<0與SKIPIF1<0共有4個交點,SKIPIF1<0與SKIPIF1<0均關(guān)于直線SKIPIF1<0對稱,所以交點也關(guān)于直線SKIPIF1<0對稱,則有SKIPIF1<0,故D正確.故選:AD.11.(2022·湖南·長郡中學(xué)模擬預(yù)測)已知函數(shù)SKIPIF1<0是奇函數(shù),則SKIPIF1<0__________.【答案】1【解析】設(shè)SKIPIF1<0,因為SKIPIF1<0是奇函數(shù),所以SKIPIF1<0,即SKIPIF1<0,整理得到SKIPIF1<0,故SKIPIF1<0.故答案為:1.12.(2022·山東煙臺·三模)若SKIPIF1<0為奇函數(shù),則SKIPIF1<0的表達(dá)式可以為SKIPIF1<0___________.【答案】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,等(答案不唯一)【解析】由SKIPIF1<0為奇函數(shù),則有SKIPIF1<0即SKIPIF1<0恒成立則SKIPIF1<0,則SKIPIF1<0為奇函數(shù)則SKIPIF1<0的表達(dá)式可以為SKIPIF1<0或SKIPIF1<0或SKIPIF1<0等故答案為:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,等13.(2022·江蘇·南京市天印高級中學(xué)模擬預(yù)測)已知SKIPIF1<0是定義在SKIPIF1<0上的函數(shù),若對任意SKIPIF1<0,都有SKIPIF1<0,且函數(shù)SKIPIF1<0的圖像關(guān)于直線SKIPIF1<0對稱,SKIPIF1<0,則SKIPIF1<0_______.【答案】3【解析】因為函數(shù)SKIPIF1<0的圖像關(guān)于直線SKIPIF1<0對稱,所以函數(shù)SKIPIF1<0的圖像關(guān)于直線SKIPIF1<0對稱,即函數(shù)SKIPIF1<0是偶函數(shù),則有SKIPIF1<0;因為對任意SKIPIF1<0,都有SKIPIF1<0,令SKIPIF1<0,得SKIPIF1<0,所以對任意SKIPIF1<0,都有SKIPIF1<0,即函數(shù)SKIPIF1<0的周期為SKIPIF1<0,則SKIPIF1<0,故答案為:SKIPIF1<0.14.(2022·山東·勝利一中模擬預(yù)測)已知函數(shù)SKIPIF1<0滿足SKIPIF1<0對任意SKIPIF1<0恒成立,又函數(shù)SKIPIF1<0的圖象關(guān)于點SKIPIF1<0對稱,且SKIPIF1<0,則SKIPIF1<0_________.【答案】SKIPIF1<0【解析】因為函數(shù)SKIPIF1<0滿足SKIPIF1<0對任意SKIPIF1<0恒成立,所以令SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0對任意SKIPIF1<0恒成立,又函數(shù)SKIPIF1<0的圖象關(guān)于點SKIPIF1<0對稱,將函數(shù)SKIPIF1<0向右平移SKIPIF1<0個單位得到SKIPIF1<0,所以SKIPIF1<0關(guān)于點SKIPIF1<0,即SKIPIF1<0為SKIPIF1<0上的奇函數(shù),所以SKIPIF1<0,又SKIPIF1<0對任意SKIPIF1<0恒成立,令SKIPIF1<0,得SKIPIF1<0,即SKIPIF1<0,再令SKIPIF1<0,得SKIPIF1<0,分析得SKIPIF1<0,所以函數(shù)SKIPIF1<0的周期為SKIPIF1<0,因為SKIPIF1<0,所以在SKIPIF1<0中,令SKIPIF1<0,得SKIPIF1<0,所以SKIPIF1<0.故答案為:SKIPIF1<0.15.(2022·全國·高三專題練習(xí))若函數(shù)SKIPIF1<0是奇函數(shù),SKIPIF1<0是偶函數(shù),且其定義域均為SKIPIF1<0.若SKIPIF1<0,求SKIPIF1<0,SKIPIF1<0的解析式.【解】依題意,函數(shù)SKIPIF1<0是奇函數(shù),SKIPIF1<0是偶函數(shù),SKIPIF1<0解得SKIPIF1<0,SKIPIF1<0.16.(2022·北京·高三專題練習(xí))設(shè)SKIPIF1<0為實數(shù),已知函數(shù)SKIPIF1<0是奇函數(shù).(1)求SKIPIF1<0的值;(2)判斷SKIPIF1<0在SKIPIF1<0上的單調(diào)性,并給出證明;(3)解關(guān)于SKIPIF1<0的不等式SKIPIF1<0.【解】(1)解:因為函數(shù)SKIPIF1<0為奇函數(shù),則SKIPIF1<0,即SKIPIF1<0SKIPIF1<0,解得SKIPIF1<0.(2)證明:由(1)可得SKIPIF1<0,則函數(shù)SKIPIF1<0為SKIPIF1<0上的增函數(shù),理由如下:任取SKIPIF1<0、SKIPIF1<0且SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,因此,函數(shù)SKIPIF1<0為SKIPIF1<0上的增函數(shù).(3)解:因為函數(shù)SKIPIF1<0為SKIPIF1<0上的奇函數(shù)且為增函數(shù),由SKIPIF1<0可得SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,因此,不等式SKIPIF1<0的解集為SKIPIF1<0.【素養(yǎng)提升】1.(2022·湖北省仙桃中學(xué)模擬預(yù)測)已知SKIPIF1<0是奇函數(shù),當(dāng)SKIPIF1<0時,SKIPIF1<0,則SKIPIF1<0的解集為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】因為SKIPIF1<0是奇函數(shù),當(dāng)SKIPIF1<0時,SKIPIF1<0;所以當(dāng)SKIPIF1<0時,SKIPIF1<0;當(dāng)SKIPIF1<0時,則SKIPIF1<0,所以SKIPIF1<0.因為SKIPIF1<0是奇函數(shù),所以SKIPIF1<0,所以SKIPIF1<0.即當(dāng)SKIPIF1<0時,SKIPIF1<0.綜上所述:SKIPIF1<0.令SKIPIF1<0,則SKIPIF1<0,所以不等式SKIPIF1<0可化為:SKIPIF1<0.當(dāng)SKIPIF1<0時,SKIPIF1<0不合題意舍去.當(dāng)SKIPIF1<0時,對于SKIPIF1<0.因為SKIPIF1<0在SKIPIF1<0上遞增,SKIPIF1<0在SKIPIF1<0上遞增,所以SKIPIF1<0在SKIPIF1<0上遞增.又SKIPIF1<0,所以由SKIPIF1<0可解得:SKIPIF1<0,即SKIPIF1<0,解得:SKIPIF1<0.故選:C2.(2022·天津·南開中學(xué)模擬預(yù)測)已知可導(dǎo)函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù).當(dāng)SKIPIF1<0時,SKIPIF1<0,則不等式SKIPIF1<0的解集為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】當(dāng)SKIPIF1<0時,SKIPIF1<0,則SKIPIF1<0則函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,又可導(dǎo)函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù)則SKIPIF1<0是SKIPIF1<0上的偶函數(shù),且在SKIPIF1<0單調(diào)遞減,由SKIPIF1<0,可得SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0則SKIPIF1<0時,不等式SKIPIF1<0可化為SKIPIF1<0又由函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,且SKIPIF1<0,SKIPIF1<0,則有SKIPIF1<0,解之得SKIPIF1<0故選:D3.(多選)(2022·江蘇泰州·模擬預(yù)測)已知定義在SKIPIF1<0上的單調(diào)遞增的函數(shù)SKIPIF1<0滿足:任意SKIPIF1<0,有SKIPIF1<0,SKIPIF1<0,則(
)A.當(dāng)SKIPIF1<0時,SKIPIF1<0B.任意SKIPIF1<0,SKIPIF1<0C.存在非零實數(shù)SKIPIF1<0,使得任意SKIPIF1<0,SKIPIF1<0D.存在非零實數(shù)SKIPIF1<0,使得任意SKIPIF1<0,SKIPIF1<0【答案】ABD【解析】對于A,令SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0;令SKIPIF1<0得:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則由SKIPIF1<0可知:當(dāng)SKIPIF1<0時,SKIPIF1<0,A正確;對于B,令SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,由A的推導(dǎo)過程知:SKIPIF1<0,SKIPIF1<0,B正確;對于C,SKIPIF1<0為SKIPIF1<0上的增函數(shù),SKIPIF1<0當(dāng)SKIPIF1<0時,SKIPIF1<0,則SKIPIF1<0;當(dāng)SKIPIF1<0時,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0不存在非零實數(shù)SKIPIF1<0,使得任意SKIPIF1<0,SKIPIF1<0,C錯誤;對于D,當(dāng)SKIPIF1<0時,SKIPIF1<0;由SKIPIF1<0,SKIPIF1<0知:SKIPIF1<0關(guān)于SKIPIF1<0,SKIPIF1<0成中心對稱,則當(dāng)SKIPIF1<0時,SKIPIF1<0為SKIPIF1<0的對稱中心;當(dāng)SKIPIF1<0時,SKIPIF1<0為SKIPIF1<0上的增函數(shù),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0;由圖象對稱性可知:此時對任意SKIPIF1<0,SKIPIF1<0,D正確.故選:ABD.4.(多選)(2022·廣東·深圳市光明區(qū)高級中學(xué)模擬預(yù)測)若SKIPIF1<0圖像上存在兩點SKIPIF1<0,SKIPIF1<0關(guān)于原點對稱,則點對SKIPIF1<0稱為函數(shù)SKIPIF1<0的“友情點對”(點對SKIPIF1<0與SKIPIF1<0視為同一個“友情點對”).若SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0有無數(shù)個“友情點對” B.SKIPIF1<0恰有SKIPIF1<0個“友情點對”C.SKIPIF1<0 D.SKIPIF1<0【答案】AD【解析】因為SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0是奇函數(shù),所以SKIPIF1<0圖像上存在無數(shù)對SKIPIF1<0,SKIPIF1<0關(guān)于原點對稱,即SKIPIF1<0有無數(shù)個“友情點對”;又因為SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,所以SKIPIF1<0是增函數(shù),SKIPIF1<0,即SKIPIF1<0,所以當(dāng)SKIPIF1<0時SKIPIF1<0是增函數(shù),SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上是增函數(shù),因為SKIPIF1<0是奇函數(shù),所以SKIPIF1<0在SKIPIF1<0上是增函數(shù),因為SKIPIF1<0,指數(shù)函數(shù)SKIPIF1<0為增函數(shù),所以SKIPIF1<0,因為SKIPIF1<0,指數(shù)函數(shù)SKIPIF1<0為增函數(shù),所以SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,故SKIPIF1<0所以SKIPIF1<0.故選:AD.5.(2022·江蘇·高三專題練習(xí))已知奇函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是增函數(shù),且SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0,SKIPIF1<0時,都有SKIPIF1<0,則不等式SKIPIF1<0的解集為______.【答案】SKIPIF1<0【解析】不等式SKIPIF1<0等價為SKIPIF1<0,即SKIPIF1<0或SKIPIF1<0,即SKIPIF1<0或SKIPIF1<0,SKIPIF1<0是奇函數(shù),且SKIPIF1<0,
SKIPIF1<0,故SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,又奇函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是增函數(shù),故SKIPIF1<0在區(qū)間SKIPIF1<0上也是增函數(shù),故SKIPIF1<0即SKIPIF1<0或SKIPIF1<0,此時SKIPIF1<0;而SKIPIF1<0即SKIPIF1<0或SKIPIF1<0,此時SKIPIF1<0;故不等式SKIPIF1<0的解集為SKIPIF1<0,故答案為:SKIPIF1<06.(2022·山東濰坊·一模)已知定義在R上的函數(shù)SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0為偶函數(shù),當(dāng)SKIPIF1<0時,SKIPIF1<0,若關(guān)于x的方程SKIPIF1<0
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