单项选择题
A.10V B.10-16V C.16V D.25-28V
A.30%-50% B.40%-60% C.30%-70% D.20%-50%
A.0.3 B.0.1 C.0.5 D.0.4
A.1.3 B.0.8 C.0.6 D.1
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