如图,已知直线y=﹣x+4与反比例函数y=kx的图象相交于点A(﹣2,a),并且与x轴相交于点B.
(1)求a的值;
(2)求反比例函数的表达式;
(3)求△AOB的面积;
(4)根据图象写出使一次函数的值大于反比例函数的值的x的取值范围.
The chief engineer of the high-speed railway ________ Shanghai to Beijing always devotes most of his time ________ his work.
我国的政权组织形式是民主集中制。( )
结束“文化大革命”十年内乱的标志是( )