若直线的方向向量和平面的法向量的数量积为零,则直线与平面( ).
向量的正交基().<img src="http://p.ananas.chaoxing.com/star3/origin/74347776bf4617039370ebd7d98d87b7.png"/>
的特征向量为() <img src='\"http://p.ananas.chaoxing.com/star3/origin/d3eec42db930eeeb55e09c4a62888fee.png\"/'/>
根据以下资料,回答下面的题目。<img src='https://img2.soutiyun.com/shangxueba/ask/17448001-17451000/17449017/20130105154035073507.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17448001-17451000/17449017/20130105154013981398.jpg' />请在第____处填上正确答案。
63 图示梁EI=常数,B点竖向位移为<img src='https://img2.soutiyun.com/latex/latex.action' />,单元杆端力向量为哪一个?( )
设a、b 是两个非零向量,且<img src='https://img2.soutiyun.com/ask/2020-10-29/97283554344948.png' />
证明对于任意正整数n和任意向量α,都有<img src='https://img2.soutiyun.com/ask/2021-01-11/979228170012506.jpg' />
试用反应机理说明如下反应现象:<img src='https://img2.soutiyun.com/ask/2020-03-13/952963477111136.png' />
若直线的方向向量与平面的法向量的数量积为零,则直线与平面( ).
圆锥形套筒冠内冠轴面与<img src='https://img2.soutiyun.com/shangxueba/ask/17613001-17616000/17614124/201511131443053767.jpg' />面的交角应为()
图示轴向受力杆1-1截面的内力N1是()KN。<img src='https://img2.soutiyun.com//1/2021-04-30/988646887847082.jpg' />
. 试计算矩阵的特征值及对应的特征向量:<img src='https://img2.soutiyun.com/ask/2020-03-04/952195931155768.png' />
全口义齿排牙时,上颌侧切牙切缘与<img src='https://img2.soutiyun.com/shangxueba/ask/18804001-18807000/18806187/2015101515070045899.jpg' />平面的关系是()
空间向量就是空间中的一条有向线段.(判断真假命题)
图示轴向拉(压)杆1-1截面的轴力为()<img src='https://img.soutiyun.com/ask/zq/20210710/994776045022345.png' />
下图所示P、Q两平面的相对几何关系是: ()。<img src='https://img2.soutiyun.com/shangxueba/ask/2022-01/5/405/20220105112016574.png' />
根据以下资料,回答下面的题目。<img src='https://img2.soutiyun.com/shangxueba/ask/17445001-17448000/17447198/20130105154035073507.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17445001-17448000/17447198/20130105154013981398.jpg' />请在第____处填上正确答案。
设<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264374908477.png' />是n维实向量,且<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264387229182.png' />战性无关,<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264401121976.png' /><img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264415373792.png' />是线性方程组
下面的橱窗运用了怎样的创意表现方法?<img src='https://img2.soutiyun.com/shangxueba/ask/2022-04/26/14/20220426162631657.jpg' />
在线性空间P[x]<sub>3</sub>中,下列向量组是否为一个基?<img src='https://img2.soutiyun.com/ask/2020-08-05/965489685242382.png' />
图示梁中C截面的弯矩是()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-11/18/714/20211118110911703.png' />
设α<sub>1</sub>,α<sub>2</sub>,···,α<sub>m</sub>和β<sub>1</sub>,β<sub>2</sub>,···,β<sub>m</sub>是n维欧氏空间V中两个向量组,证明存在一正交变换<img src='https://img2.soutiyun.com/ask/2021-01-07/978883779274006.jpg' />使<img src='https://img2.soutiyun.com/ask/2021-01-07/978883793368812.jpg' />的充分必要条件为<img src='https://img2.soutiyun.com/ask/2021-01-07/978883812679917.jpg' />
若向量β不能由<img src='https://img2.soutiyun.com/ask/2021-01-01/978361429025286.png' />线性表示,则向量组<img src='https://img2.soutiyun.com/ask/2021-01-01/978361441040973.png' />线性无关()此题为判断题(对,错)。
<img src='https://img2.soutiyun.com/ask/2021-01-10/979153938128196.png' />是可能的吗?子以说明。