When revising, should notice the answer should write the answering question area that provides in primary problem number inside, can be otherwise when scanning by cut away.

6, encounter constructive problem how to do

When feigned graph is inscribed, answer to use 2B pencil draw to go out first, after affirming carefully, reoccupy 0.5 millimeter black signs pen picture is clear, after such constructive answer passes scanning, image just can compare clarity.