Figure 1:

1, 26- 13 root number 3

2、3

3、30

4、2

Figures 2 and 3:

1、B

2、C

3、C

Figure 4:

1、P = 14.3/V； 7. 15kg/m？

2、 1435

Figure 5:

1、C

2、D

Figure 6:

1、 1:2

2、8; 16

3. Crossing the diagonal intersection of parallelogram

4、540

Figures 7 and 8:

1、B

2、C

3. A.

4、C

Figure 9:

1, one, three

Step 2: small

3、3/2; six

Figures 10 and 1 1:

1、A

2、C

3、C

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