设闭环离散系统如图所示，其中采样周期为 1s，则下列说法正确的是（）<br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/42636361299c04b62a0612d936c64531.jpg"/><br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/9df9ea58c621314d3bd82c0e370c941b.jpg"/>作用下的稳态误差为<img src="https://static.zxtiku.com/wangke/imgs/topic/f2d2d6f413f21fac8e9d352adcb8de48.jpg"/>‍<br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/5703fa1945bb0a07d05f54f86affe036.jpg"/>作用下的稳态误差为<img src="https://static.zxtiku.com/wangke/imgs/topic/c905b452f1fc214db56b952780189ead.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/67183e383c31de7f5f7c863aea409e48.jpg"/>作用下的稳态误差为<img src="https://static.zxtiku.com/wangke/imgs/topic/01358bc095358c78fa75dbe2b29e7c45.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/5703fa1945bb0a07d05f54f86affe036.jpg"/>作用下的稳态误差为<img src="https://static.zxtiku.com/wangke/imgs/topic/cd61e549f798bff2070796d42d2db8c2.jpg"/>‍