A、<span style="font-size:16px;font-family:宋体">开环比值控制</span><span style="font-size:16px;font-family: 'Times New Roman','serif'"> </span>
B、<span style="font-size:16px;font-family:宋体">单闭环比值控制</span><span style="font-size:16px;font-family:'Times New Roman','serif'"> </span>
C、<span style="font-size:16px;font-family:宋体">双闭环比值控制</span><span style="font-size:16px;font-family:'Times New Roman','serif'"> </span>
D、<span style="font-size:16px;font-family:宋体">变比值控制</span>
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