发信号转移点
signaling transfer points
前向转移信号
Forward-Transfer Signal FOT
层层转包和违法分包
multi-level contracting and illegal sub-contracting
层间间隔时间
time interval of two-layer roller compact
time interval between layers
分层转移
transferring level by level
绝缘层信移连接件
IDC:Insucation Displacement Connection