A、<span style="FONT-FAMILY: 宋体; mso-bidi-font-family: ">系统稳定</span>
B、<span style="FONT-FAMILY: 宋体; mso-bidi-font-family: ">系统不稳定</span>
C、<span style="FONT-FAMILY: 宋体; mso-bidi-font-family: ">当其幅值裕度大于<span lang="EN-US">0</span>分贝时<span lang="EN-US">,</span>系统稳定</span>
D、<span style="FONT-FAMILY: 宋体; mso-bidi-font-family: ">当其幅值裕度小于或等于<span lang="EN-US">0</span>分贝时<span lang="EN-US">,</span>系统稳定</span>