A.50mm B.100mm C.150mm D.200mm
A.故障工单受理及时性 B.工单处理及时率 C.工单平均处理时长
A.≤H/1250 B.≤H/1350 C.≤H/1400 D.≤H/1500
A.3；7 B.5；10 C.7；15 D.2；5
A.5Ω B.10Ω C.15Ω D.20Ω
