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易錯(cuò)點(diǎn)03函數(shù)概念與基本函數(shù)易錯(cuò)點(diǎn)1:求解與函數(shù)有關(guān)的問題易忽略定義域優(yōu)先的原則;研究與函數(shù)有關(guān)的問題時(shí),一定要先明確函數(shù)的定義域是什么,才能進(jìn)行下一步工作。易錯(cuò)點(diǎn)2:判斷函數(shù)奇偶性時(shí),易忽略檢驗(yàn)函數(shù)定義域是否關(guān)于原點(diǎn)對(duì)稱;判斷奇偶性的方法是在定義域關(guān)于原點(diǎn)對(duì)稱的前提下,根據(jù)SKIPIF1<0與SKIPIF1<0的關(guān)系得到結(jié)論;易錯(cuò)點(diǎn)3:根據(jù)定義證明函數(shù)的單調(diào)性時(shí),規(guī)范格式是什么?(取值,作差,判正負(fù));判斷單調(diào)性的關(guān)鍵是能夠根據(jù)自變量的范圍化簡(jiǎn)函數(shù),根據(jù)單調(diào)性的性質(zhì)和復(fù)合函數(shù)“同增異減”性得到結(jié)論.易錯(cuò)點(diǎn)4:指對(duì)型函數(shù)比較大小要熟練掌握常用初等函數(shù)的單調(diào)性如:一次函數(shù)的單調(diào)性取決于一次項(xiàng)系數(shù)的符號(hào),二次函數(shù)的單調(diào)性決定于二次項(xiàng)系數(shù)的符號(hào)及對(duì)稱軸的位置,指數(shù)函數(shù)、對(duì)數(shù)函數(shù)的單調(diào)性決定于其底數(shù)的范圍(大于1還是小于1),特別在解決涉及指、對(duì)復(fù)合函數(shù)的單調(diào)性問題時(shí)要樹立分類討論的數(shù)學(xué)思想(對(duì)數(shù)型函數(shù)還要注意定義域的限制).易錯(cuò)點(diǎn)5:用函數(shù)圖象解題時(shí)作圖不準(zhǔn)“數(shù)形結(jié)合”是重要思想方法之一,以其準(zhǔn)確、快速、靈活及操作性強(qiáng)等諸多優(yōu)點(diǎn)頗受數(shù)學(xué)學(xué)習(xí)者的青睞。但我們?cè)诮忸}時(shí)應(yīng)充分利用函數(shù)性質(zhì),畫準(zhǔn)圖形,不能主觀臆造,導(dǎo)致圖形“失真”,從而得出錯(cuò)誤的答案。易錯(cuò)點(diǎn)6:在涉及指對(duì)型函數(shù)的單調(diào)性有關(guān)問題時(shí),沒有根據(jù)性質(zhì)進(jìn)行分類討論的意識(shí)和易忽略對(duì)數(shù)函數(shù)的真數(shù)的限制條件;要熟練掌握常用初等函數(shù)的單調(diào)性如:一次函數(shù)的單調(diào)性取決于一次項(xiàng)系數(shù)的符號(hào),二次函數(shù)的單調(diào)性決定于二次項(xiàng)系數(shù)的符號(hào)及對(duì)稱軸的位置,指數(shù)函數(shù)、對(duì)數(shù)函數(shù)的單調(diào)性決定于其底數(shù)的范圍(大于1還是小于1),特別在解決涉及指、對(duì)復(fù)合函數(shù)的單調(diào)性問題時(shí)要樹立分類討論的數(shù)學(xué)思想(對(duì)數(shù)型函數(shù)還要注意定義域的限制);易錯(cuò)點(diǎn)7:抽象函數(shù)的推理不嚴(yán)謹(jǐn)致誤;所謂抽象函數(shù)問題,是指沒有具體地給出函數(shù)的解析式,只給出它的一些特征或性質(zhì)。解決這類問題常涉及到函數(shù)的概念和函數(shù)的各種性質(zhì),因而它具有抽象性、綜合性和技巧性等特點(diǎn);解決抽象函數(shù)的方法有:換元法、方程組法、待定系數(shù)法、賦值法、轉(zhuǎn)化法、遞推法等;考點(diǎn)一:函數(shù)的單調(diào)性和奇偶性1.(2021年高考全國(guó)甲卷理科)設(shè)函數(shù)SKIPIF1<0的定義域?yàn)镽,SKIPIF1<0為奇函數(shù),SKIPIF1<0為偶函數(shù),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.若SKIPIF1<0,則SKIPIF1<0()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】因?yàn)镾KIPIF1<0是奇函數(shù),所以SKIPIF1<0①;因?yàn)镾KIPIF1<0是偶函數(shù),所以SKIPIF1<0②.令SKIPIF1<0,由①得:SKIPIF1<0,由②得:SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,令SKIPIF1<0,由①得:SKIPIF1<0,所以SKIPIF1<0.思路一:從定義入手.SKIPIF1<0SKIPIF1<0SKIPIF1<0所以SKIPIF1<0.思路二:從周期性入手由兩個(gè)對(duì)稱性可知,函數(shù)SKIPIF1<0的周期SKIPIF1<0.所以SKIPIF1<0.故選:D.2.(2021年全國(guó)高考甲卷數(shù)學(xué)(文)試題)下列函數(shù)中是增函數(shù)的為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】1.對(duì)于A,SKIPIF1<0為SKIPIF1<0上的減函數(shù),不合題意,舍.對(duì)于B,SKIPIF1<0為SKIPIF1<0上的減函數(shù),不合題意,舍.對(duì)于C,SKIPIF1<0在SKIPIF1<0為減函數(shù),不合題意,舍.對(duì)于D,SKIPIF1<0為SKIPIF1<0上的增函數(shù),符合題意,故選:D.3.(2021年全國(guó)高考乙卷數(shù)學(xué)(文)試題)設(shè)函數(shù)SKIPIF1<0,則下列函數(shù)中為奇函數(shù)的是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【分析】由題意可得SKIPIF1<0,對(duì)于A,SKIPIF1<0不是奇函數(shù);對(duì)于B,SKIPIF1<0是奇函數(shù);對(duì)于C,SKIPIF1<0,定義域不關(guān)于原點(diǎn)對(duì)稱,不是奇函數(shù);對(duì)于D,SKIPIF1<0,定義域不關(guān)于原點(diǎn)對(duì)稱,不是奇函數(shù).故選:B4.(2021年高考全國(guó)乙卷理科)設(shè)函數(shù)SKIPIF1<0,則下列函數(shù)中為奇函數(shù)的是 ()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由題意可得SKIPIF1<0,對(duì)于A,SKIPIF1<0不是奇函數(shù);對(duì)于B,SKIPIF1<0是奇函數(shù);對(duì)于C,SKIPIF1<0,定義域不關(guān)于原點(diǎn)對(duì)稱,不是奇函數(shù);對(duì)于D,SKIPIF1<0,定義域不關(guān)于原點(diǎn)對(duì)稱,不是奇函數(shù).故選:B5. (2021新高考2卷)已知函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,SKIPIF1<0為偶函數(shù),SKIPIF1<0為奇函數(shù),則()ASKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】因?yàn)楹瘮?shù)SKIPIF1<0為偶函數(shù),則SKIPIF1<0,可得SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0為奇函數(shù),則SKIPIF1<0,所以,SKIPIF1<0,所以,SKIPIF1<0,即SKIPIF1<0,故函數(shù)SKIPIF1<0是以SKIPIF1<0為周期的周期函數(shù),因?yàn)楹瘮?shù)SKIPIF1<0為奇函數(shù),則SKIPIF1<0,故SKIPIF1<0,其它三個(gè)選項(xiàng)未知.故選:B6.(2021年上海卷)以下哪個(gè)函數(shù)既是奇函數(shù),又是減函數(shù)() A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】由題易知,只有SKIPIF1<0既是奇函數(shù)又是減函數(shù),故選A考點(diǎn)二:指對(duì)型函數(shù)比較大小1. (2021年天津卷5)設(shè)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】D【解析】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.故選:D.2.(2021年新高考2卷7)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則下列判斷正確的是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】SKIPIF1<0,即SKIPIF1<0.故選:C.3.(2020年全國(guó)2卷11)若SKIPIF1<0,則 A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】SKIPIF1<0.設(shè)SKIPIF1<0,則SKIPIF1<0,所以函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,從而SKIPIF1<0,故選A.4.(2021年全國(guó)1卷理12)若SKIPIF1<0,則 A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由指數(shù)與對(duì)數(shù)運(yùn)算可得:SKIPIF1<0,又因?yàn)镾KIPIF1<0,即SKIPIF1<0,令SKIPIF1<0,由指對(duì)函數(shù)單調(diào)性可得SKIPIF1<0在SKIPIF1<0內(nèi)單調(diào)遞增,由SKIPIF1<0可得:SKIPIF1<0,所以選B.5.(2019全國(guó)Ⅲ理11)設(shè)是定義域?yàn)榈呐己瘮?shù),且在單調(diào)遞減,則A.B.C.D.【答案】C【解析】是定義域?yàn)榈呐己瘮?shù),所以,
因?yàn)?,,所以?/p>
又在上單調(diào)遞減,所以.故選C.6.(2015年全國(guó)2卷12)設(shè)函數(shù)f’(x)是奇函數(shù)的導(dǎo)函數(shù),SKIPIF1<0,當(dāng)時(shí),,則使得成立的x的取值范圍是()A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0【答案】【解析】令,因?yàn)闉槠婧瘮?shù),所以為偶函數(shù),由于,當(dāng)時(shí),,所以在上單調(diào)遞減,根據(jù)對(duì)稱性在上單調(diào)遞增,又,,數(shù)形結(jié)合可知,使得成立的的取值范圍是.考點(diǎn)三、函數(shù)的圖像與性質(zhì)1. (2021年天津卷3)函數(shù)SKIPIF1<0的圖像大致為A. B.C. D.【答案】B【解析】設(shè)SKIPIF1<0,則函數(shù)SKIPIF1<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),排除AC;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0,排除D.故選:B.2.(2019全國(guó)Ⅲ理7)函數(shù)SKIPIF1<0在SKIPIF1<0的圖像大致為B.C.D.【解析】因?yàn)镾KIPIF1<0,
所以SKIPIF1<0是SKIPIF1<0上的奇函數(shù),因此排除C,
又SKIPIF1<0,因此排除A,D.故選B.3.(2021年浙江卷7)已知函數(shù)SKIPIF1<0,則圖象為右圖的函數(shù)可能是(). A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0 【答案】D 【解析】SKIPIF1<0是偶函數(shù),SKIPIF1<0是奇函數(shù),由于圖象是奇函數(shù),所以C,D正確,由于SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0C選項(xiàng)不符合,故選D.4.(2021年全國(guó)甲卷16)已知函數(shù)SKIPIF1<0的部分圖象如圖所示,則滿足條件SKIPIF1<0的最小正整數(shù)SKIPIF1<0為_____________.【答案】2【解析】由SKIPIF1<0,得SKIPIF1<0,SKIPIF1<0,將SKIPIF1<0代入SKIPIF1<0得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.SKIPIF1<0等價(jià)于SKIPIF1<0,等價(jià)于SKIPIF1<0或SKIPIF1<0,由圖像得最小整數(shù)SKIPIF1<0,所以SKIPIF1<0★5.(2015年全國(guó)2卷)如圖,長(zhǎng)方形ABCD的邊AB=2,BC=1,O是AB的中點(diǎn),點(diǎn)P沿著邊BC,CD與DA運(yùn)動(dòng),記∠BOP=x.將動(dòng)點(diǎn)P到A、B兩點(diǎn)距離之和表示為x的函數(shù)f(x),則f(x)的圖像大致為()【答案】B【解析】由于SKIPIF1<0,故排除選項(xiàng)C、D;當(dāng)點(diǎn)SKIPIF1<0在SKIPIF1<0上時(shí),SKIPIF1<0.不難發(fā)現(xiàn)SKIPIF1<0的圖像是非線性,排除A.故選B.★6.(2014年全國(guó)1卷)如圖,圓O的半徑為1,A是圓上的定點(diǎn),P是圓上的動(dòng)點(diǎn),角SKIPIF1<0的始邊為射線SKIPIF1<0,終邊為射線SKIPIF1<0,過點(diǎn)SKIPIF1<0作直線SKIPIF1<0的垂線,垂足為SKIPIF1<0,將點(diǎn)SKIPIF1<0到直線SKIPIF1<0的距離表示為SKIPIF1<0的函數(shù)SKIPIF1<0,則SKIPIF1<0=SKIPIF1<0在[0,SKIPIF1<0]上的圖像大致為()【答案】C【解析】由題意知,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,故選C.考點(diǎn)四、分段函數(shù)1.(2021年浙江卷12)已知SKIPIF1<0,函數(shù)SKIPIF1<0若SKIPIF1<0則SKIPIF1<0. 【答案】2 【解析】SKIPIF1<0,即SKIPIF1<0.解得SKIPIF1<0.2.(2015新課標(biāo)Ⅱ)設(shè)函數(shù)SKIPIF1<0,則SKIPIF1<0A.3B.6C.9D.12【答案】C【解析】由于SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.3.(2017新課標(biāo)Ⅲ)設(shè)函數(shù)SKIPIF1<0則滿足SKIPIF1<0的SKIPIF1<0的取值范圍是________.【答案】SKIPIF1<0【解析】當(dāng)SKIPIF1<0時(shí),不等式為SKIPIF1<0恒成立;當(dāng)SKIPIF1<0,不等式SKIPIF1<0恒成立;當(dāng)SKIPIF1<0時(shí),不等式為SKIPIF1<0,解得SKIPIF1<0,即SKIPIF1<0;綜上,SKIPIF1<0的取值范圍為SKIPIF1<0.
4.(2014新課標(biāo))設(shè)函數(shù)SKIPIF1<0則使得SKIPIF1<0成立的SKIPIF1<0的取值范圍是______.【答案】SKIPIF1<0【解析】當(dāng)SKIPIF1<0時(shí),由SKIPIF1<0得SKIPIF1<0,∴SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),由SKIPIF1<0得SKIPIF1<0,∴SKIPIF1<0,綜上SKIPIF1<0.5. (2021年天津卷9)設(shè)SKIPIF1<0,函數(shù)SKIPIF1<0,若SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)恰有6個(gè)零點(diǎn),則a的取值范圍是A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】SKIPIF1<0最多有2個(gè)根,所以SKIPIF1<0至少有4個(gè)根,由SKIPIF1<0可得SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,(1)SKIPIF1<0時(shí),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0有4個(gè)零點(diǎn),即SKIPIF1<0;當(dāng)SKIPIF1<0,SKIPIF1<0有5個(gè)零點(diǎn),即SKIPIF1<0;當(dāng)SKIPIF1<0,SKIPIF1<0有6個(gè)零點(diǎn),即SKIPIF1<0;(2)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0無零點(diǎn);當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0有1個(gè)零點(diǎn);當(dāng)SKIPIF1<0時(shí),令SKIPIF1<0,則SKIPIF1<0,此時(shí)SKIPIF1<0有2個(gè)零點(diǎn);所以若SKIPIF1<0時(shí),SKIPIF1<0有1個(gè)零點(diǎn).綜上,要使SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)恰有6個(gè)零點(diǎn),則應(yīng)滿足SKIPIF1<0或SKIPIF1<0或SKIPIF1<0,則可解得a的取值范圍是SKIPIF1<0.6.(2018全國(guó)卷Ⅰ)已知函數(shù)SKIPIF1<0,SKIPIF1<0.若SKIPIF1<0存在2個(gè)零點(diǎn),則a的取值范圍是()A.[–1,0)B.[0,+∞)C.[–1,+∞)D.[1,+∞)【答案】C【解析】函數(shù)SKIPIF1<0存在2個(gè)零點(diǎn),即關(guān)于SKIPIF1<0的方程SKIPIF1<0有2個(gè)不同的實(shí)根,即函數(shù)SKIPIF1<0的圖象與直線SKIPIF1<0有2個(gè)交點(diǎn),作出直線SKIPIF1<0與函數(shù)SKIPIF1<0的圖象,如圖所示,由圖可知,SKIPIF1<0,解得SKIPIF1<0,故選C.1.函數(shù)在單調(diào)遞減,且為奇函數(shù).若,則滿足的的取值范圍是().A.[-2,2]QUOTE[?2,2]B.[-1,2]QUOTE[?1,1]C.[0,4]QUOTE[0,4]D.[1,3]【答案】D【解析】由函數(shù)SKIPIF1<0為奇函數(shù),得SKIPIF1<0,不等式SKIPIF1<0即為SKIPIF1<0,又SKIPIF1<0在SKIPIF1<0單調(diào)遞減,所以得SKIPIF1<0,即SKIPIF1<0,選D.2.設(shè)函數(shù)SKIPIF1<0,SKIPIF1<0的定義域都為SKIPIF1<0,且SKIPIF1<0是奇函數(shù),SKIPIF1<0是偶函數(shù),則下列結(jié)論正確的是()A.SKIPIF1<0SKIPIF1<0是偶函數(shù)B.SKIPIF1<0|SKIPIF1<0|是奇函數(shù)C.|SKIPIF1<0|SKIPIF1<0是奇函數(shù)D.|SKIPIF1<0SKIPIF1<0|是奇函數(shù)【答案】B【解析】SKIPIF1<0為奇函數(shù),SKIPIF1<0為偶函數(shù),故SKIPIF1<0SKIPIF1<0為奇函數(shù),SKIPIF1<0|SKIPIF1<0|為奇函數(shù),|SKIPIF1<0|SKIPIF1<0為偶函數(shù),|SKIPIF1<0SKIPIF1<0|為偶函數(shù),故選B.3.下列函數(shù)中,既是偶函數(shù)又在SKIPIF1<0單調(diào)遞增的函數(shù)是()A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0【答案】B【解析】SKIPIF1<0為奇函數(shù),SKIPIF1<0在SKIPIF1<0上為減函數(shù),在SKIPIF1<0上為減函數(shù).4.已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則()A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0【答案】A【解析】因?yàn)镾KIPIF1<0,SKIPIF1<0,SKIPIF1<0,且冪函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,指數(shù)函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,故選A.5.若SKIPIF1<0,則()A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0【答案】C【解析】選項(xiàng)A,考慮冪函數(shù)SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0為增函數(shù),又SKIPIF1<0,所以SKIPIF1<0,A錯(cuò).對(duì)于選項(xiàng)B,SKIPIF1<0SKIPIF1<0,又SKIPIF1<0是減函數(shù),所以B錯(cuò).對(duì)于選項(xiàng)D,由對(duì)數(shù)函數(shù)的性質(zhì)可知D錯(cuò),故選C.6.設(shè)函數(shù)SKIPIF1<0,則SKIPIF1<0A.3B.6C.9D.12【答案】C【解析】由于SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.7.
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