How to know the structure of cable and wire with a picture?

1-core cable 2-core cable:

3-core circular cable and 3-core sector cable:

4-core circular cable and 4-core sector cable:

3 + 1 core circular cable, 3 + 1 core sectorcable:

5-core circular cable 3 + 2-core circular cable:

4 + 1 core circular cable, medium voltage single core cable:

Medium voltage three core cable, frequency conversion cable:

Control cable, 8-core kvvp2 zra-kvvr three core kyjvrp7 core, photovoltaic cable:

Laying wire and optical fiber composite low pressure cable: