单项选择题
A.0.6 B.0.8 C.1.0 D.1.5
A.1-5 B.2-7 C.3-8 D.4-9
A.1MΩ B.1.5MΩ C.2MΩ D.5MΩ
A.30%-40% B.45%-60% C.60%-65% D.80%以上
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