A.1m B.2m C.3m
A.應(yīng)當 B.必須 C.可以
A.報警值≥1.0%,斷電值≥1.0%,復電值<1.0% B.報警值≥1.5%,斷電值≥1.5%,復電值<1.0% C.報警值≥1.0%,斷電值≥1.5%,復電值<1.0%