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【单选题】
UG8型液压调速器是一种具有双反馈的液压调速器，其双反馈的作用是（）。 Ⅰ.用刚性反馈控制δ1 Ⅱ.用刚性反馈控制δ2 Ⅲ.用弹性反馈控制δ1 Ⅳ.用弹性反馈控制δ2 Ⅴ.用刚性反馈提高调速器灵敏性 Ⅵ.用弹性反馈控制稳定时间tsA.
Ⅱ＋Ⅲ＋Ⅵ
B.
Ⅱ＋Ⅲ＋Ⅳ
C.
Ⅰ＋Ⅲ＋Ⅴ
D.
Ⅱ＋Ⅳ＋Ⅵ
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