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A.healthy B.heavy C.head D.heat
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如图正方形ABCD的边长为3a两动点EF分别从顶点BC同时开始以相同速度沿BCCD运动与△BCF相
如图矩形EFGH的四个顶点分别在矩形ABCD的各条边上AB=EFFG=2GC=3.有以下四个结论①
如图△ABC为等边三角形以边BC为直径的半圆与边ABAC分别交于DF两点过点D作DE⊥AC垂足为点
作为固态胶体的煤其内部存在许多毛细管及孔隙这些空隙的总体积占煤的整个体积的百分数叫做煤的空隙率空隙率
空隙率=(DHe-DHg)/DHe×100%P367
空隙率=(DHe-DH/DHg×100%
空隙率=(DHg-DH/DHg×100%
空隙率=(DHg-DH/(DHg+DH×100%
作为固态胶体的煤其内部存在许多毛细管及孔隙这些空隙的总体积占煤 的整个体积的百分数叫做煤的空隙率空隙
空隙率= (DHe-DHg)/DHe×100%
空隙率= (DHe-DHa)/DHg×100%
空隙率= (DHg-DHe)/DHg×100%
空隙率= (DHg-DHe)/(DHg+DHe)×100%
如图正方形ABCD的边长为3a两动点E.F分别从顶点B.C同时开始以相同速度沿BC.CD运动与△BC
已知在菱形ABCD中∠ADC=60°点H为CD上任意一点不与CD重合过点H作CD的垂线交BD于点E
如图E.是正方形ABCD的边CD延长线上的任意一点CF⊥AE于点F.交AD于点H..求∠DHE的度数
如图1在平面直角坐标系中O是坐标原点▱ABCD的顶点A的坐标为﹣20点D的坐标为02点B在x轴的正
如图1在平面直角坐标系中O.是坐标原点□ABCD的顶点A.的坐标为-20点D.的坐标为0点B.在轴的
如图矩形EFGH的四个顶点分别在矩形ABCD的各条边上AB=EFFG=2GC=3.有以下四个结论①
可见光固化复合树脂最常用的胺活化剂是
过氧化苯甲酰(BP
三丁基硼
樟脑醌
N,N-二乙基对甲苯胺(DHE
N,N-二甲胺甲基丙烯酸乙酯
三月三放风筝小明制了一个风筝如右图且DE=DFEH=FH小明不用度量就知道∠DEH=∠DFH请你用所
如图1在平面直角坐标系中O是坐标原点▱ABCD的顶点A的坐标为﹣20点D的坐标为02点B在x轴的正
如图矩形EFGH的四个顶点分别在矩形ABCD的各条边上AB=EFFG=2GC=3.有以下四个结论①
如图正方形ABCD的边长为2点EFGH分别在ADABBCCD上的点且AE=BF=CG=DH分别将△
B
CD上的点,且AE=BF=CG=DH,分别将
△
AEF.
△
BFG.
△
CGH.
△
DHE沿EF.FG.GH.HE翻折,得四边形MNKP,设AE=x,S
四边形MNKP
=y,则y关于x的函数图象大致为( )
A.
B.
C.
可见光固化复合树脂最常用的促进剂是
过氧化苯甲酰(BP
樟脑醌
三丁基硼
N,N-二羟乙基对甲苯胺(DHE
N,N-二甲胺甲基丙烯酸乙酯
Whenwewerechildrenweweretaughtthesimplestlessonsto
将△ACE绕点C旋转一定的角度后使点A落在点B处点E在落在点D处且BCE在同一直线上ACBD交于点
@C.E在同一直线上,AC.BD交于点F,C
AE交于点G,A
BD交于点H,连接AB.DE.则下列结论错误的是( )
A.∠DHE=∠ACB B.△ABH∽△GDH C.DHG∽△ECG D.△ABC∽△DEC
可见光固化复合树脂最常用的引发剂是
三丁基硼
N,N-二羟乙基对甲苯胺(DHE
过氧化苯甲酰(BP
N,N-二甲胺甲基丙烯酸乙酯
樟脑醌
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TheUnitedStates56alargepartoftheNorthAmericancontinent.ItsneighborsareCanada57thenorth58Mexicotothesouth.59theUnitedStatesisabigcountryit’snotthelargestintheworld.In1964its60wasover185000000. Whenthislandfirstbecameanationafter61independencefromEnglandithadthirteenstates62ofthestateswasrepresentedontheAmericanflagbya63.Allthestateswereintheeasternpartofthecontinent.Asthenationgrewtowardsthewestnewstateswereintheeasternpartofthecontinent.Asthenationgrewtowardsthewestnewstateswereaddedandnewstars64ontheflag.Foralongtimetherewere48states.In1959howevertwo65starswereaddedtotheflag66thenewstates67AlaskaandHawaii. Sometimes68issaidthattheIndiansaretheonlyrealAmericans.MostAmericanshoweveraredescendants后代ofpeoplev69camefromallovertheworldtofindanew70inanewland.71whocamefirstand72greatestnumberstomaketheirhome73theeasterncoastofNorthAmericaweremostlyfromEngland.Itis74thatreasonthatthelanguageoftheUnitedStatesisEnglishandthatitscultureandcustomsaremorelike75ofEnglandthanofanyothercountryintheworld. 68
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