【单选题】直线 的方向向量为 且过抛物线 的焦点,则直线 与抛物线围成的封闭图形面积为( )
【单选题】要了解全国的人口情况,则总体单位是( )。
【简答题】完形填空 What would I do for Carol's 50th birthday? It was __ 1 __ that she didn't want a party, certainly not a surprise party(that was an agreement at our marriage). 'How about a small dinner with __ 2 ...
【单选题】纯电感电路中电感上的电流与电压的相位关系是
【简答题】完形填空 What would I do for Carol’s 50th birthday? It was __ 1 __ that she didn't want a party, certainly not a surprise party (that was an agreement at our marriage). 'How about a small dinner with ...
【单选题】若直线 的方向向量为 ,平面 的法向量为 ,则
【简答题】一条直线的方向向量为(1,-2),且过点(1,0),该直线的方程为______.
【单选题】直线l的直线方程为ax+by+c=0,则该直线的方向向量为