A、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">扩大调节阀的可调范围</span></strong>
B、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">用于生产安全</span></strong>
C、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">用于节能控制</span></strong>
D、<strong style="line-height: 33px; white-space: normal;"><span style="font-family: 宋体;">用于消除纯滞后</span></strong>