单位负反馈系统中 <img src="https://static.zxtiku.com/wangke/imgs/topic/7ec1cd3914375ae0fe0867cd4f9a47a9.jpg"/>当<img src="https://static.zxtiku.com/wangke/imgs/topic/1ec61880ea7169abb4aea1a253da7aec.jpg"/>时<img src="https://static.pphuashu.com/wangke/imgs/topic/bc24fec65dfbc461ba36f94921f0fefd.jpg.png"/>。 ( ) <br/> 正确 <br/> 错误