15.
如图,两个一次函数图象的交点坐标为(2,4),则关于x,y的方程组$\left\{\begin{array}{l}{y={k}_{1}x+{b}_{1}}\\{y={k}_{2}x+{b}_{2}}\end{array}\right.$的解为( )
| A. | $\left\{\begin{array}{l}{x=2}\\{y=4}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{x=4}\\{y=2}\end{array}\right.$ | C. | $\left\{\begin{array}{l}{x=-4}\\{y=0}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{x=3}\\{y=0}\end{array}\right.$ |
13.在下面的四个几何体中,主视图是三角形的是( )
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| A. | B. | C. | D. |