A、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体; font-size: 14px;">开环</span></strong>
B、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体; font-size: 14px;">闭环</span></strong>
C、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体; font-size: 14px;">随动</span></strong>
D、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体; font-size: 14px;">比值</span></strong>