7.方程组$\left\{\begin{array}{l}{mx+2y=3}\\{x-3y=-4n}\end{array}\right.$有无数个解,则m、n的值为( )
| A. | m=$\frac{9}{8}$,n=-$\frac{2}{3}$ | B. | m=-$\frac{2}{3}$,n=$\frac{9}{8}$ | C. | m=$\frac{2}{3}$,n=-$\frac{9}{8}$ | D. | m=1,n=-$\frac{3}{4}$ |
6.下列图形中,不是轴对称图形的是( )
0 285567 285575 285581 285585 285591 285593 285597 285603 285605 285611 285617 285621 285623 285627 285633 285635 285641 285645 285647 285651 285653 285657 285659 285661 285662 285663 285665 285666 285667 285669 285671 285675 285677 285681 285683 285687 285693 285695 285701 285705 285707 285711 285717 285723 285725 285731 285735 285737 285743 285747 285753 285761 366461
| A. | 线段MN | B. | 等边三角形ABC | C. | 钝角∠ADB | D. | 直角三角形 |