A.9 B.3 C.1/9 D.1/3
A.0.1µA B.1µA C.10µA D.100µA
A.开环 B.半闭环 C.单闭环 D.全闭环
A.24 B.26 C.28 D.30
A.1 B.2 C.5 D.8
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