2, 1:250000

3, the bottom is high.

4. Objection

5. Omission

6, 10:5=8:4

7. Be positive

8, 1:200

9. Ratio product

10, 15:8

1 1, reverse.

12, 12:20

Two. x √ √ x x

Third, c a b b c d a c

⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙???

I also made this test paper, and the teacher assigned three. I'm too busy!