选修4-2:矩阵与变换 已知矩阵A= m 0 -1 n .在平面直角坐标系中,设直线l:2x+y-7=0在矩阵A对应的变换作用下得到另一直线l′:9x+y-91=0,求实数m、n的值.
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【单选题】Topic 26 Session 1 4-2 Read the sentence pairs. Choose which word or phrase best fits each blank. 2-B _______________________________ identifies problems.
【单选题】Topic 26 Session 1 4-2 Read the sentence pairs. Choose which word or phrase best fits each blank. 2-A _______________________________ stops problems from occurring.