On October 22, 2020, on a sunny day, at 15:30, a batch of connecting plate components in the workshop were sprayed with primer after sand washing. The sand washing reached Sa2 ½ level. No structure number was seen.
On October 22, 2020, on a sunny day, at 15:30, a batch of connecting plate components in the workshop was sprayed with primer after sanding, which reached Sa2 1/2 level and did not see the structure number.
At 15:30 on October 22, 2020, a batch of connecting plate components in the workshop were sprayed with primer after sand washing. The sand washing reached SA2 / 2 grade, and no structure number was found.<br>