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The two compounds CoCu(obbz)(H2O)4·2H2O (I) and CoCu(obze)(H2O)4·2H2O (II) have been synthesized, and their crystal structures have been determined at room temperature. Both compounds crystallize in the monoclinic system, space group P21/n. The lattice parameters are a = 7.8190(6) ...
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如图,三棱柱OAB—O1A1B1,平面OBB1O1⊥平面OAB,∠O1OB=60°,∠AOB=90°,且OB=OO1=2,OA= ,求异面直线A1B与AO1所成角的大小. 试题答案 在线课程 解析:用平移A1B或AO1的方法求解,是很困难的,于是我们很自然想到向量法求解.充分利用∠AOB=90°,建立空间直角坐标系,写出有关点及向量的坐标,将几何问题转...
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A、B为两定点,在AB所在平面上异于O点的一侧取A'点和B'点,使角OAA'=角OBB’=90度,且BB’=OB,AA’=OA,设A’B’的中点为O’,想想看,当O点在该平面上移动时,A’B’的中点O’的位置将怎样变化?并证明你的猜想.---过O’ A’ B’分别做AB的垂线,分别交于 O” M N 再过O做AB的垂线交与P 则...
某非金属X的最低负价为-m.它的最高价氧化物对应的水化物中有b个氧原子.则这种酸的分子式为( )A.H2b-8+mXObB.H2b-m+8XOb C.H2b-8-mXObD.H2b+8+mXOb