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巴中市普通高中2022級(jí)2022年秋學(xué)期聯(lián)考數(shù)學(xué)一、單項(xiàng)選擇題:本題共8小題,每小題5分,共40分.在每小題給出的四個(gè)選項(xiàng)中,只有一項(xiàng)是符合題目要求的.1.集合SKIPIF1<0用列舉法表示為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】【分析】直接求出集合中的元素即可.【詳解】SKIPIF1<0.故選:C.2.函數(shù)SKIPIF1<0定義域?yàn)椋ǎ〢.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】【分析】由SKIPIF1<0計(jì)算得解.【詳解】由SKIPIF1<0得SKIPIF1<0,所以函數(shù)SKIPIF1<0定義域?yàn)镾KIPIF1<0.故選:A.3.若SKIPIF1<0,則()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】【分析】取特殊值排除AC,SKIPIF1<0,則SKIPIF1<0,B錯(cuò)誤,根據(jù)冪函數(shù)的單調(diào)性得到D正確,得到答案.【詳解】對(duì)選項(xiàng)A:取SKIPIF1<0,滿足SKIPIF1<0,SKIPIF1<0不成立,錯(cuò)誤;對(duì)選項(xiàng)B:SKIPIF1<0,則SKIPIF1<0,錯(cuò)誤;對(duì)選項(xiàng)C:取SKIPIF1<0,滿足SKIPIF1<0,SKIPIF1<0,錯(cuò)誤;對(duì)選項(xiàng)D:SKIPIF1<0,則SKIPIF1<0,正確.故選:D4.命題SKIPIF1<0的否定為()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】【分析】根據(jù)存在量詞命題的否定是全稱量詞命題可得答案.【詳解】命題SKIPIF1<0的否定為SKIPIF1<0.故選:B5.已知SKIPIF1<0,則a,b,c的大小關(guān)系為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】【分析】根據(jù)冪函數(shù)與對(duì)數(shù)函數(shù)的單調(diào)性可得答案.【詳解】根據(jù)冪函數(shù)SKIPIF1<0在SKIPIF1<0上為增函數(shù),可得SKIPIF1<0,即SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0.故選:B6.已知SKIPIF1<0,則SKIPIF1<0()A.9 B.3 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】【分析】計(jì)算得到SKIPIF1<0,代入得到SKIPIF1<0,得到答案.【詳解】SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0.故選:A7.“函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上不單調(diào)”是“SKIPIF1<0”的()A.充分不必要條件 B.必要不充分條件C.充分且必要條件 D.既不充分也不必要條件【答案】C【解析】【分析】根據(jù)二次函數(shù)的單調(diào)性以及充分且必要條件的概念可得答案.【詳解】由函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上不單調(diào),可得SKIPIF1<0,即SKIPIF1<0;由SKIPIF1<0,得SKIPIF1<0,得函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上不單調(diào),所以“函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上不單調(diào)”是“SKIPIF1<0”的充分且必要條件.故選:C8.通過實(shí)驗(yàn)數(shù)據(jù)可知,某液體蒸發(fā)速度y(單位:升/小時(shí))與液體所處環(huán)境的溫度x(單位:SKIPIF1<0)近似地滿足函數(shù)關(guān)系SKIPIF1<0(SKIPIF1<0為自然對(duì)數(shù)的底數(shù),a,b為常數(shù)).若該液體在SKIPIF1<0的蒸發(fā)速度是0.2升/小時(shí),在SKIPIF1<0的蒸發(fā)速度是0.4升/小時(shí),則該液體在SKIPIF1<0的蒸發(fā)速度為()A.0.5升/小時(shí) B.0.6升/小時(shí) C.0.7升/小時(shí) D.0.8升/小時(shí)【答案】D【解析】【分析】由題意可得SKIPIF1<0,求出SKIPIF1<0,再將SKIPIF1<0代入即可得解.【詳解】由題意得SKIPIF1<0,兩式相除得SKIPIF1<0,所以SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以該液體在SKIPIF1<0的蒸發(fā)速度為0.8升/小時(shí).故選:D.二、多項(xiàng)選擇題:本題共4小題,每小題5分,共20分.在每小題給出的選項(xiàng)中,有多項(xiàng)符合題目要求.全部選對(duì)的得5分,部分選對(duì)的得2分,有選錯(cuò)的得0分.9.下列函數(shù)中,在其定義域內(nèi)既是奇函數(shù)又是增函數(shù)的是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】BD【解析】【分析】根據(jù)奇函數(shù)的定義判斷函數(shù)奇偶性,利用單調(diào)性的定義和性質(zhì)判斷函數(shù)的增減性.【詳解】選項(xiàng)四個(gè)函數(shù)定義域都是R,函數(shù)SKIPIF1<0的斜率為-2,在R上單調(diào)遞減,故A錯(cuò)誤;函數(shù)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0是奇函數(shù),任取SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在R上單調(diào)遞增;故B正確;SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0單調(diào)遞增,故C錯(cuò)誤;SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0是奇函數(shù),因?yàn)镾KIPIF1<0單調(diào)遞增,SKIPIF1<0單調(diào)遞減,所以SKIPIF1<0在R上單調(diào)遞增,故D正確.故選:BD.10.下列命題中正確的有()A.集合SKIPIF1<0的真子集是SKIPIF1<0B.SKIPIF1<0是菱形SKIPIF1<0SKIPIF1<0是平行四邊形SKIPIF1<0C.設(shè)SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0DSKIPIF1<0【答案】BC【解析】【分析】根據(jù)空集是任何非空集合的真子集可知A不正確;根據(jù)菱形一定是平行四邊形,可知B正確;根據(jù)集合相等的概念求出SKIPIF1<0,可知C正確;根據(jù)SKIPIF1<0可知D不正確.【詳解】對(duì)于A,集合SKIPIF1<0的真子集是SKIPIF1<0,SKIPIF1<0,故A不正確;對(duì)于B,因?yàn)榱庑我欢ㄊ瞧叫兴倪呅?,所以SKIPIF1<0是菱形SKIPIF1<0SKIPIF1<0是平行四邊形SKIPIF1<0,故B正確;對(duì)于C,因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,故C正確;對(duì)于D,因?yàn)镾KIPIF1<0是實(shí)數(shù),所以SKIPIF1<0無解,所以SKIPIF1<0,故D不正確.故選:BC11.設(shè)函數(shù)SKIPIF1<0滿足SKIPIF1<0,則下列結(jié)論正確的是()A.SKIPIF1<0 B.SKIPIF1<0C.若SKIPIF1<0,則SKIPIF1<0 D.若SKIPIF1<0,則SKIPIF1<0【答案】ABD【解析】【分析】根據(jù)SKIPIF1<0求出SKIPIF1<0,繼而判斷A;對(duì)于B.根據(jù)SKIPIF1<0化簡(jiǎn)得解;對(duì)于C.根據(jù)判別式小于等于0計(jì)算即可;對(duì)于D.SKIPIF1<0等價(jià)于SKIPIF1<0,借助基本不等式計(jì)算得解.【詳解】SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0對(duì)于A.SKIPIF1<0,所以A正確;對(duì)于B.SKIPIF1<0SKIPIF1<0,所以對(duì)于SKIPIF1<0,所以B正確;對(duì)于C.SKIPIF1<0等價(jià)于SKIPIF1<0恒成立,所以SKIPIF1<0,所以C錯(cuò)誤;.對(duì)于D.SKIPIF1<0等價(jià)于SKIPIF1<0SKIPIF1<0當(dāng)且僅當(dāng)SKIPIF1<0即SKIPIF1<0時(shí),等號(hào)成立故選:ABD.12.已知函數(shù)SKIPIF1<0,則()A.SKIPIF1<0的圖象關(guān)于y軸對(duì)稱 B.SKIPIF1<0與SKIPIF1<0的圖象有唯一公共點(diǎn)C.SKIPIF1<0的解集為SKIPIF1<0 D.SKIPIF1<0【答案】ABD【解析】【分析】利用偶函數(shù)定義可判斷A正確;解方程SKIPIF1<0可判斷B正確;解不等式SKIPIF1<0可判斷C不正確;先證明SKIPIF1<0在SKIPIF1<0上為增函數(shù),再根據(jù)對(duì)數(shù)知識(shí)以及SKIPIF1<0的單調(diào)性和奇偶性可判斷D正確.【詳解】因?yàn)镾KIPIF1<0的定義域?yàn)镾KIPIF1<0,關(guān)于原點(diǎn)對(duì)稱,又SKIPIF1<0,所以函數(shù)SKIPIF1<0為偶函數(shù),其圖象關(guān)于SKIPIF1<0軸對(duì)稱,故A正確;由SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,所以SKIPIF1<0與SKIPIF1<0的圖象有唯一公共點(diǎn)SKIPIF1<0,故B正確;由SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,即SKIPIF1<0的解集為SKIPIF1<0,故C不正確;設(shè)SKIPIF1<0,則SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0在SKIPIF1<0上為增函數(shù),因?yàn)镾KIPIF1<0,SKIPIF1<0為偶函數(shù),所以SKIPIF1<0,故D正確.故選:ABD三、填空題:本題共4小題,每小題5分,共20分.13.已知SKIPIF1<0,則SKIPIF1<0___________.【答案】17【解析】【分析】直接計(jì)算得到答案.【詳解】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.故答案為:SKIPIF1<014.已知冪函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則實(shí)數(shù)m的值為___________.【答案】1【解析】【分析】根據(jù)冪函數(shù)的概念以及冪函數(shù)在SKIPIF1<0上的單調(diào)性可得結(jié)果.【詳解】根據(jù)冪函數(shù)的定義可得SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,不合題意;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0SKIPIF1<0上單調(diào)遞增,符合題意.故答案為:SKIPIF1<0.15.某商場(chǎng)以每件30元的價(jià)格購進(jìn)一種商品,根據(jù)銷售經(jīng)驗(yàn),這種商品每天的銷量m(件)與售價(jià)x(元)滿足一次函數(shù)SKIPIF1<0,若要每天獲得最大的銷售利潤,則每件商品的售價(jià)應(yīng)定為___________元.【答案】40【解析】【分析】根據(jù)題意求出某商場(chǎng)每天獲得銷售利潤SKIPIF1<0關(guān)于售價(jià)x的函數(shù)關(guān)系式,再根據(jù)二次函數(shù)知識(shí)可求出結(jié)果.【詳解】設(shè)某商場(chǎng)每天獲得銷售利潤為SKIPIF1<0(元),則SKIPIF1<0SKIPIF1<0,因?yàn)镾KIPIF1<0,所以當(dāng)SKIPIF1<0(元)時(shí),SKIPIF1<0取得最大值為SKIPIF1<0(元).所以若要每天獲得最大的銷售利潤,則每件商品的售價(jià)應(yīng)定為SKIPIF1<0元.故答案為:4016.已知函數(shù)SKIPIF1<0若SKIPIF1<0恰有2個(gè)零點(diǎn),則實(shí)數(shù)a的取值范圍是___________.【答案】SKIPIF1<0或SKIPIF1<0【解析】【分析】先求出SKIPIF1<0和SKIPIF1<0的根,再根據(jù)SKIPIF1<0恰有2個(gè)零點(diǎn),以及SKIPIF1<0的解析式可得SKIPIF1<0的范圍.【詳解】又SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0;由SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0或SKIPIF1<0,因?yàn)镾KIPIF1<0恰有2個(gè)零點(diǎn),所以若SKIPIF1<0和SKIPIF1<0是函數(shù)SKIPIF1<0的零點(diǎn),則SKIPIF1<0不是函數(shù)SKIPIF1<0的零點(diǎn),則SKIPIF1<0;若SKIPIF1<0和SKIPIF1<0是函數(shù)SKIPIF1<0的零點(diǎn),則SKIPIF1<0不是函數(shù)SKIPIF1<0的零點(diǎn),則SKIPIF1<0,若SKIPIF1<0和SKIPIF1<0是函數(shù)SKIPIF1<0的零點(diǎn),SKIPIF1<0不是函數(shù)SKIPIF1<0的零點(diǎn),則不存在這樣的SKIPIF1<0.綜上所述:實(shí)數(shù)a的取值范圍是SKIPIF1<0或SKIPIF1<0.故答案:SKIPIF1<0或SKIPIF1<0.四、解答題:本題共6小題,共70分.解答應(yīng)寫出文字說明、證明過程或演算步驟.17.已知集合SKIPIF1<0.(1)求集合A;(2)若SKIPIF1<0,求實(shí)數(shù)a的取值范圍.【答案】(1)SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)根據(jù)分式不等式的解法解不等式,即可得出集合SKIPIF1<0;(2)由SKIPIF1<0,得SKIPIF1<0,再根據(jù)集合的包含關(guān)系列出不等式即可得解.【小問1詳解】由SKIPIF1<0有SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,所以集合SKIPIF1<0;【小問2詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,由(1)知SKIPIF1<0,而SKIPIF1<0,顯然SKIPIF1<0,則有SKIPIF1<0,解得SKIPIF1<0,即實(shí)數(shù)a的取值范圍是SKIPIF1<0.18.已知函數(shù)SKIPIF1<0與SKIPIF1<0互為反函數(shù),記函數(shù)SKIPIF1<0.(1)若SKIPIF1<0,求x的取值范圍;(2)若SKIPIF1<0,求SKIPIF1<0的最大值.【答案】(1)SKIPIF1<0(2)最大值為6【解析】【分析】(1)根據(jù)題意可得SKIPIF1<0,根據(jù)一元二次不等式結(jié)合指數(shù)函數(shù)單調(diào)性解不等式;(2)換元令SKIPIF1<0,結(jié)合二次函數(shù)求最值.【小問1詳解】因?yàn)镾KIPIF1<0與SKIPIF1<0互為反函數(shù),則SKIPIF1<0,故SKIPIF1<0.不等式SKIPIF1<0,即為SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,故SKIPIF1<0,所以x的取值范圍是SKIPIF1<0.【小問2詳解】令SKIPIF1<0,則SKIPIF1<0,函數(shù)SKIPIF1<0等價(jià)轉(zhuǎn)化為SKIPIF1<0,則SKIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取得最大值SKIPIF1<0,故當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0的最大值為6.19.已知SKIPIF1<0.(1)求a,b的值;(2)若SKIPIF1<0,用b,c表示SKIPIF1<0的值.【答案】(1)SKIPIF1<0,SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)根據(jù)指數(shù)和對(duì)數(shù)的運(yùn)算性質(zhì)可求出SKIPIF1<0,SKIPIF1<0可得結(jié)果;(2)根據(jù)指數(shù)式與對(duì)數(shù)式的互化以及對(duì)數(shù)的運(yùn)算性質(zhì)可得結(jié)果.【小問1詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,SKIPIF1<0(舍去),故SKIPIF1<0.【小問2詳解】由(1)知,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.20.設(shè)函數(shù)SKIPIF1<0,已知不等式SKIPIF1<0的解集是SKIPIF1<0.(1)求不等式SKIPIF1<0的解集;(2)對(duì)任意SKIPIF1<0,比較SKIPIF1<0與SKIPIF1<0的大小.【答案】(1)SKIPIF1<0或SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)化為SKIPIF1<0是方程SKIPIF1<0的解,求出SKIPIF1<0,再解不等式SKIPIF1<0可得結(jié)果;(2)作差比較可得結(jié)論.【小問1詳解】因?yàn)椴坏仁絊KIPIF1<0的解集是SKIPIF1<0.所以SKIPIF1<0是方程SKIPIF1<0的解,由韋達(dá)定理得:SKIPIF1<0,故不等式SKIPIF1<0為SKIPIF1<0,解得其解集為SKIPIF1<0或SKIPIF1<0.【小問2詳解】由(1)知,SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0.21.在“①函數(shù)SKIPIF1<0是偶函數(shù);②函數(shù)SKIPIF1<0是奇函數(shù).”這兩個(gè)條件中選擇一個(gè)補(bǔ)充在下列的橫線上,并作答問題.已知函數(shù)SKIPIF1<0,且___________.(1)求SKIPIF1<0的解析式;(2)判斷SKIPIF1<0在SKIPIF1<0上的單調(diào)性,并根據(jù)單調(diào)性定義證明你的結(jié)論.注:如果選擇多個(gè)條件分別解答,按第一個(gè)解答計(jì)分.【答案】(1)選①,SKIPIF1<0,選②,SKIPIF1<0.(2)答案見解析【解析】【分析】(1)選①,解法一:由SKIPIF1<0,求出SKIPIF1<0,檢驗(yàn)后即可;解法二:由SKIPIF1<0求出SKIPIF1<0;選②,解法一:由SKIPIF1<0求出SKIPIF1<0,檢驗(yàn)后即可;解法二:由SKIPIF1<0求出SKIPIF1<0;(2)由定義法求解函數(shù)的單調(diào)性步驟,取值,作差,判號(hào),下結(jié)論.【小問1詳解】若選擇①函數(shù)SKIPIF1<0是偶函數(shù).解法一:根據(jù)題意,易得函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0.由SKIPIF1<0為偶函數(shù),因此SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,經(jīng)檢驗(yàn)SKIPIF1<0符合題設(shè),所以SKIPIF1<0.解法二:由題,SKIPIF1<0在SKIPIF1<0上恒成立,則SKIPIF1<0恒成立,則有SKIPIF1<0,即SKIPIF1<0恒成立,所以,SKIPIF1<0.所以SKIPIF1<0.若選擇②函數(shù)SKIPIF1<0是奇函數(shù).解法一:根據(jù)題意,易得函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0.由SKIPIF1<0為奇函數(shù),因此SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,經(jīng)檢驗(yàn)SKIPIF1<0符合題設(shè),所以SKIPIF1<0.解法二:SKIPIF1<0在SKIPIF1<0上恒成立,SKIPIF1<0恒成立,即SKIPIF1<0恒成立,所以,SKIPIF1<0.所以SKIPIF1<0.【小問2詳解】若選擇①,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減.證明:SKIPIF1<0,且SKIPIF1<0,有SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,所以SKIPIF1<0,于是SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,所以,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減.若選擇②,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增.證明:SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0由SKIPIF
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