单项选择题
A.20 B.19 C.18.5 D.18
A.0.5% B.0.05% C.0.04% D.0.1%
A.5mm B.5μm C.1mm D.1μm
A.指示 B.报警 C.切断被控电源 D.指示、报警、切断被控电源
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