A、<span style="font-size:16px;font-family:宋体">开环控制 </span>
B、<span style="font-size:16px;font-family:宋体">根据可测干扰进行调节 </span>
C、<span style="font-size:16px;font-family:宋体">有稳定性问题</span>
D、<span style="font-size:16px;font-family:宋体">仪表的零点 </span>
E、<span style="font-size:16px;font-family:宋体">仪表的绝对误差</span>
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