题目3单选题
系统结构图如下图所示.试判别系统闭环稳定性,并确定系统的稳态误差essr及essn.( )<img src="https://tihai-oss-cloud.itihey.com/img/a765e78c9dcdbe02abc0697458912fcb.webp">A. 稳定,0,<img src="https://tihai-oss-cloud.itihey.com/img/27441b6ee034e1ef032a734516326d46.png">B. 稳定,0,0C. 系统不稳定D. 稳定,<img src="https://tihai-oss-cloud.itihey.com/img/def63add310409a2e9824d4de6e30be7.png">