A、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">斜坡信号</span></strong>
B、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">阶跃信号</span></strong>
C、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">随机信号</span></strong>
D、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">方波信号</span></strong>