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第一篇熱點(diǎn)、難點(diǎn)突破篇專(zhuān)題11平面向量綜合問(wèn)題(練)【對(duì)點(diǎn)演練】一、單選題1.(2022春·河南洛陽(yáng)·高三校聯(lián)考階段練習(xí))已知向量SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則實(shí)數(shù)m的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】求出SKIPIF1<0,根據(jù)向量垂直,則點(diǎn)乘為0,得到關(guān)于SKIPIF1<0的方程,解出即可.【詳解】SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,解得SKIPIF1<0.故選:A.2.(2022春·江蘇·高三江蘇省新海高級(jí)中學(xué)校聯(lián)考階段練習(xí))已知向量SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0的最大值為(
)A.1 B.2 C.SKIPIF1<0 D.4【答案】B【分析】根據(jù)向量平行得到SKIPIF1<0,再利用均值不等式計(jì)算得到答案.【詳解】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,即SKIPIF1<0,當(dāng)SKIPIF1<0,SKIPIF1<0或SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0且SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0時(shí)等號(hào)成立;綜上所述:SKIPIF1<0的最大值為SKIPIF1<0.故選:B3.(2022春·遼寧錦州·高三校考階段練習(xí))已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(
)A.1 B.SKIPIF1<0 C.2 D.SKIPIF1<0或2【答案】C【分析】根據(jù)數(shù)量積的運(yùn)算律,即可求出.【詳解】因?yàn)镾KIPIF1<0SKIPIF1<0,所以,SKIPIF1<0.故選:C.4.(2021春·云南昆明·高三昆明市第三中學(xué)??茧A段練習(xí))已知SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0(
)A.1 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】根據(jù)題意將SKIPIF1<0代入到SKIPIF1<0中,展開(kāi)后將SKIPIF1<0,SKIPIF1<0代入,即可得出選項(xiàng).【詳解】解:由題知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則有SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,SKIPIF1<0.故選:C5.(2021春·內(nèi)蒙古·高三??计谀┮阎蛄縎KIPIF1<0,SKIPIF1<0,則“SKIPIF1<0”是“SKIPIF1<0”的(
)A.充分不必要條件 B.必要不充分條件C.充分必要條件 D.既不充分也不必要條件【答案】B【分析】由SKIPIF1<0,解出SKIPIF1<0的值,再根據(jù)充分必要條件的概念,得解.【詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,所以“SKIPIF1<0”是“SKIPIF1<0”的必要不充分條件.故選:B.6.(2022春·廣西南寧·高三統(tǒng)考階段練習(xí))如圖,在SKIPIF1<0中,SKIPIF1<0為SKIPIF1<0上一點(diǎn),且滿足SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】根據(jù)基底向量方法,以SKIPIF1<0為基底表達(dá)SKIPIF1<0,進(jìn)而根據(jù)數(shù)量積公式求解即可.【詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.故選:C二、多選題7.(2022春·福建福州·高三校聯(lián)考期中)已知向量SKIPIF1<0,則下列結(jié)論正確的是(
)A.若SKIPIF1<0,則SKIPIF1<0 B.若SKIPIF1<0,則SKIPIF1<0C.若SKIPIF1<0,則SKIPIF1<0 D.若SKIPIF1<0,則SKIPIF1<0【答案】AB【分析】根據(jù)向量平行的坐標(biāo)表示判斷A,根據(jù)向量垂直的坐標(biāo)表示判斷B,根據(jù)向量的模的坐標(biāo)表示判斷C,D.【詳解】對(duì)于A,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,A正確;對(duì)于B,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,B正確;對(duì)于C,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,C錯(cuò)誤;對(duì)于D,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0或SKIPIF1<0,D錯(cuò)誤;故選:AB.三、填空題8.(2021春·云南昆明·高三昆明市第三中學(xué)校考階段練習(xí))已知向量SKIPIF1<0的夾角為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0______.【答案】SKIPIF1<0【分析】根據(jù)數(shù)量積的性質(zhì)以及模長(zhǎng)公式計(jì)算即可.【詳解】向量SKIPIF1<0的夾角為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.故答案為:SKIPIF1<09.(2022·重慶沙坪壩·重慶八中??寄M預(yù)測(cè))已知向量SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0與SKIPIF1<0共線,則實(shí)數(shù)SKIPIF1<0___________.【答案】SKIPIF1<0或SKIPIF1<0##SKIPIF1<0或SKIPIF1<0【分析】根據(jù)向量共線的坐標(biāo)表示可直接構(gòu)造方程求得結(jié)果.【詳解】SKIPIF1<0與SKIPIF1<0共線,SKIPIF1<0,即SKIPIF1<0,解得:SKIPIF1<0或SKIPIF1<0.故答案為:SKIPIF1<0或SKIPIF1<0.10.(2022·四川成都·統(tǒng)考一模)已知SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0的最小值是_____________.【答案】SKIPIF1<0【分析】由題意,SKIPIF1<0均在圓心為原點(diǎn),半徑為SKIPIF1<0的圓上,再根據(jù)數(shù)量積公式,結(jié)合幾何意義分析最值求解即可.【詳解】解:由題知,SKIPIF1<0三點(diǎn)共圓,圓心為坐標(biāo)原點(diǎn),半徑為SKIPIF1<0,所以,SKIPIF1<0,設(shè)SKIPIF1<0,數(shù)形結(jié)合可得SKIPIF1<0在SKIPIF1<0上的投影SKIPIF1<0,所以,SKIPIF1<0,即SKIPIF1<0,故當(dāng)SKIPIF1<0,SKIPIF1<0時(shí)SKIPIF1<0有最小值SKIPIF1<0,此時(shí)SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0時(shí)SKIPIF1<0有最大值SKIPIF1<0,所以,SKIPIF1<0綜上,SKIPIF1<0的取值范圍是SKIPIF1<0,所以,SKIPIF1<0的最小值是SKIPIF1<0故答案為:SKIPIF1<0【沖刺提升】一、單選題1.(2022春·河南·高三安陽(yáng)一中校聯(lián)考階段練習(xí))在△ABC中,SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【分析】根據(jù)平面向量基本定理求解可得SKIPIF1<0,SKIPIF1<0,進(jìn)而可得答案.【詳解】由SKIPIF1<0可得SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.故選:B.2.(2021春·吉林四平·高三四平市第一高級(jí)中學(xué)校考階段練習(xí))設(shè)直線SKIPIF1<0經(jīng)過(guò)定點(diǎn)SKIPIF1<0,SKIPIF1<0軸上的兩個(gè)動(dòng)點(diǎn)SKIPIF1<0與SKIPIF1<0的距離為2,則SKIPIF1<0的最小值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.2 D.3【答案】D【分析】根據(jù)直線點(diǎn)斜式的方程,結(jié)合平面向量坐標(biāo)表示公式進(jìn)行求解即可.【詳解】由SKIPIF1<0,所以直線SKIPIF1<0過(guò)定點(diǎn)SKIPIF1<0,因?yàn)镾KIPIF1<0軸上的兩個(gè)動(dòng)點(diǎn)SKIPIF1<0與SKIPIF1<0的距離為2,所以不妨設(shè)SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0有最小值SKIPIF1<0,故選:D3.(2022·陜西寶雞·統(tǒng)考一模)已知向量SKIPIF1<0,SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0夾角為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】根據(jù)向量的點(diǎn)乘關(guān)系,求出SKIPIF1<0,即可求出SKIPIF1<0,SKIPIF1<0夾角.【詳解】解:由題意,在向量SKIPIF1<0,SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0解得:SKIPIF1<0∴SKIPIF1<0故選:C.4.(2022·浙江·模擬預(yù)測(cè))在平行四邊形SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【分析】結(jié)合平行四邊形的性質(zhì)及平面向量的基本定理即可求解.【詳解】因?yàn)樗倪呅蜸KIPIF1<0為平行四邊形,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0所以SKIPIF1<0,SKIPIF1<0,因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0,故選:B.5.(2022·全國(guó)·高三校聯(lián)考階段練習(xí))已知SKIPIF1<0是雙曲線SKIPIF1<0的左、右焦點(diǎn),點(diǎn)M是過(guò)坐標(biāo)原點(diǎn)O且傾斜角為60°的直線l與雙曲線C的一個(gè)交點(diǎn),且SKIPIF1<0則雙曲線C的離心率為(
)A.2 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】由SKIPIF1<0得到SKIPIF1<0,SKIPIF1<0,結(jié)合SKIPIF1<0,求出SKIPIF1<0,SKIPIF1<0,利用雙曲線定義得到方程,求出離心率.【詳解】不妨設(shè)點(diǎn)M在第一象限,由題意得:SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0,故SKIPIF1<0,因?yàn)镺為SKIPIF1<0的中點(diǎn),所以SKIPIF1<0,因?yàn)镾KIPIF1<0,故SKIPIF1<0為等邊三角形,故SKIPIF1<0,SKIPIF1<0,由雙曲線定義可知:SKIPIF1<0,即SKIPIF1<0,解得:SKIPIF1<0.故選:C.6.(2022·青海西寧·湟川中學(xué)??家荒#┮阎獔ASKIPIF1<0的弦AB的中點(diǎn)為SKIPIF1<0,直線AB交y軸于點(diǎn)M,則SKIPIF1<0的值為(
)A.4 B.5 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】求出SKIPIF1<0,由垂徑定理得到SKIPIF1<0,求出AB所在直線的方程,聯(lián)立圓的方程,得到兩根之積,進(jìn)而得到SKIPIF1<0,求出SKIPIF1<0,SKIPIF1<0的值.【詳解】由題設(shè)可得SKIPIF1<0,圓心SKIPIF1<0,則SKIPIF1<0.根據(jù)圓的性質(zhì)可知,SKIPIF1<0,∴AB所在直線的方程為SKIPIF1<0,即SKIPIF1<0.聯(lián)立方程SKIPIF1<0,可得:SKIPIF1<0,設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0,SKIPIF1<0中,令SKIPIF1<0,得SKIPIF1<0,∴SKIPIF1<0.故選:A.7.(2022春·山東濰坊·高三統(tǒng)考階段練習(xí))銳角三角形ABC中,D為邊BC上一動(dòng)點(diǎn)(不含端點(diǎn)),點(diǎn)O滿足SKIPIF1<0,且滿足SKIPIF1<0,則SKIPIF1<0的最小值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.3 D.SKIPIF1<0【答案】D【分析】根據(jù)向量線性運(yùn)算表示出SKIPIF1<0,由此求得SKIPIF1<0,再根據(jù)基本不等式求得SKIPIF1<0的最小值.【詳解】依題意SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立.故選:D二、多選題8.(2022春·安徽·高三石室中學(xué)校聯(lián)考階段練習(xí))如圖,正方形SKIPIF1<0的邊長(zhǎng)為SKIPIF1<0,動(dòng)點(diǎn)SKIPIF1<0在正方形內(nèi)部及邊上運(yùn)動(dòng),SKIPIF1<0,則下列結(jié)論正確的有(
)A.點(diǎn)SKIPIF1<0在線段SKIPIF1<0上時(shí),SKIPIF1<0為定值B.點(diǎn)SKIPIF1<0在線段SKIPIF1<0上時(shí),SKIPIF1<0為定值C.SKIPIF1<0的最大值為SKIPIF1<0D.使SKIPIF1<0的SKIPIF1<0點(diǎn)軌跡長(zhǎng)度為SKIPIF1<0【答案】AC【分析】以點(diǎn)SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0、SKIPIF1<0所在直線分別為SKIPIF1<0、SKIPIF1<0軸建立平面直角坐標(biāo)系,設(shè)點(diǎn)SKIPIF1<0,利用平面向量的坐標(biāo)運(yùn)算逐項(xiàng)判斷,可得出合適的選項(xiàng).【詳解】以點(diǎn)SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0、SKIPIF1<0所在直線分別為SKIPIF1<0、SKIPIF1<0軸建立如下圖所示的平面直角坐標(biāo)系,設(shè)點(diǎn)SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,當(dāng)點(diǎn)SKIPIF1<0在線段SKIPIF1<0上時(shí),SKIPIF1<0,SKIPIF1<0,故A正確;當(dāng)點(diǎn)SKIPIF1<0在線段SKIPIF1<0上時(shí),SKIPIF1<0不是定值,SKIPIF1<0不為定值,故B錯(cuò)誤;由SKIPIF1<0得SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,故當(dāng)SKIPIF1<0時(shí),即當(dāng)點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0重合時(shí),SKIPIF1<0取得最大值SKIPIF1<0,故C正確;由SKIPIF1<0得SKIPIF1<0,直線SKIPIF1<0交SKIPIF1<0軸于點(diǎn)SKIPIF1<0,交SKIPIF1<0軸于點(diǎn)SKIPIF1<0,所以,使SKIPIF1<0的SKIPIF1<0點(diǎn)軌跡為線段SKIPIF1<0,且SKIPIF1<0,故D錯(cuò)誤.故選:AC.三、填空題9.(2022春·山東聊城·高三山東聊城一中校考階段練習(xí))已知雙曲線SKIPIF1<0的左?右焦點(diǎn)分別是SKIPIF1<0,SKIPIF1<0,P是雙曲線右支上一點(diǎn),SKIPIF1<0,O為坐標(biāo)原點(diǎn),過(guò)點(diǎn)O作SKIPIF1<0的垂線,垂足為點(diǎn)H,若雙曲線的離心率SKIPIF1<0,存在實(shí)數(shù)m滿足SKIPIF1<0,則SKIPIF1<0___________.【答案】SKIPIF1<0【分析】由題意,可得相似三角形,根據(jù)相似三角形性質(zhì),建立等量關(guān)系,結(jié)合離心率的公式,建立方程,可得答案.【詳解】當(dāng)SKIPIF1<0時(shí),代入雙曲線可得SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,由題易得SKIPIF1<0.由相似三角形的性質(zhì)可知,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,整理得SKIPIF1<0.SKIPIF1<0,SKIPIF1<0,解得SKIPIF1<0.故答案為:SKIPIF1<0.10.(2022·四川成都·成都七中??家荒#┮阎猄KIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0的取值范圍是___________.【答案】SKIPIF1<0【分析】由題意,SKIPIF1<0均在圓心為原點(diǎn),半徑為2的圓上,再根據(jù)數(shù)量積公式,結(jié)合幾何意義分析最值求解即可.【詳解】由題意,SKIPIF1<0,故SKIPIF1<0均在圓心為原點(diǎn),半徑為2的圓上.①當(dāng)SKIPIF1<0為直徑時(shí),SKIPIF1<0,又SKIPIF1<0為SKIPIF1<0在直徑SKIPIF1<0上的投影,故SKIPIF1<0,此時(shí)SKIPIF1<0;②當(dāng)SKIPIF1<0不為直徑時(shí),SKIPIF1<0,設(shè)SKIPIF1<0,數(shù)形結(jié)合可得SKIPIF1<0在SKIPIF1<0上的投影SKIPIF1<0,故SKIPIF1<0,即SKIPIF1<0,故當(dāng)SKIPIF1<0,SKIPIF1<0時(shí)SKIPIF1<0有最小值SKIPIF1<0,此時(shí)SKIPIF1<0.綜上可得SKIPIF1<0的取值范圍是SKIPIF1<0.故答案為:SKIPIF1<011.(2022春·廣東深圳·高三校考階段練習(xí))SKIPIF1<0是邊長(zhǎng)為2的正三角形,動(dòng)點(diǎn)SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的最大值__________.【答案】3【分析】建立直角坐標(biāo)系,寫(xiě)出各點(diǎn)的坐標(biāo),根據(jù)SKIPIF1<0可推出SKIPIF1<0點(diǎn)的軌跡方程為SKIPIF1<0SKIPIF1<0,是一個(gè)圓(去掉SKIPIF1<0軸上兩點(diǎn)).推導(dǎo)可得SKIPIF1<0SKIPIF1<0,進(jìn)而構(gòu)造SKIPIF1<0,根據(jù)SKIPIF1<0與SKIPIF1<0方向相同時(shí),有最大值,即可解出答案.【詳解】如圖,取SKIPIF1<0的中點(diǎn)為SKIPIF1<0,連結(jié)SKIPIF1<0,則SKIPIF1<0.以SKIPIF1<0所在的直線為SKIPIF1<0軸,以SKIPIF1<0所在的直線為SKIPIF1<0軸,建立平面直角坐標(biāo)系.則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.因?yàn)镾KIPIF1<0,所以SKIPIF1<0,整理可得SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0點(diǎn)的軌跡方程為SKIPIF1<0SKIPIF1<0.SKIPIF1<0SKIPIF1<0SKIPIF1<0.要使SKIPIF1<0最大,則應(yīng)有SKIPIF1<0最大,只有當(dāng)SKIPIF1<0與SKIPIF1<0方向相同時(shí),有最大值.如圖,根據(jù)平行四邊形法則,構(gòu)造SKIPIF1<0,則SKIPIF1<0.延長(zhǎng)SKIPIF1<0至SKIPIF1<0,使SKIPIF1<0,則有SKIPIF1<0,即SKIPIF1<0,所以當(dāng)SKIPIF1<0與SKIPIF1<0方向相同時(shí),有最大值,即點(diǎn)SKIPIF1<0為線段SKIPIF1<0與圓的交點(diǎn),此時(shí)有SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0.故答案為:3.四、解答題12
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