题目

如图所示，或门的输入端输入信号为何时，输出端输出“0”（  ）                                                                                                                                               A． 0   0        B． 0  1      C． 1  0       D． 1  1                                                                         若直线y＝(m－2)x＋n＋5经过二、三、四象限，则直线y＝－(n＋5)x＋4－2m一定不经过________象限．