Make the inserting block stretch out to the Angle steel of guiding track framework, and can draw back reliably.
使插块灵活可靠地伸出到导轨架标准节角钢上，并能可靠缩回。
2
Finally, we draw an important conclusion that the routability of a single switch block can not completely represent the quality of switch block topology.
还得出一个重要结论：单一开关块的布线能力并不能完全说明开关块拓扑的好坏。
3
Draw the main center lines and block in the general outline of the views with light, sharp 6h pencil lines.