A.60m B.90m C.100m D.150m
A.150m B.100m C.75m D.60m
A.綜合布線系統(tǒng)工程設(shè)計規(guī)范 B.合布線系統(tǒng) C.商用建筑物電信布線標準 D.商用建筑接地/連接要求