The schematic diagram or the wiring diagram is divided into three sections ie. section1 , section 2 and section 3 .
part 或 area 应该都可以.
机器的电路图
The wiring diagram of the machine is divided into three sections ie. section A , section B and section C .
电路图中的一区、二区、三区 In section A , B and C of the wiring diagram .