单项选择题
A.特殊巡视 B.定期巡视 C.夜间巡视 D.事故巡视
A.2m B.3m C.6m D.10m
A.0.5m B.0.2m C.0.4m D.0.5m
A.8-10m B.12m C.15m D.20m
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