单项选择题
A.0.5～0.7m B.0.7～1m C.1～1.5m D.1.5～2m
A.固定牢固 B.可拆卸 C.耐磨损 D.抗打击
A.70MΩ B.50MΩ C.20MΩ D.10MΩ
A.0.1% B.0.15% C.0.2% D.0.25%
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