N
Y
I S-A
钢管 t u be

![0_image_4.png](0_image_4.png)

pe filtering selection

N

![0_image_0.png](0_image_0.png)

![0_image_3.png](0_image_3.png)

selection paradigm N
include P
R
p

![0_image_6.png](0_image_6.png)

![0_image_5.png](0_image_5.png)

![0_image_7.png](0_image_7.png)

![0_image_9.png](0_image_9.png)

![0_image_8.png](0_image_8.png)

![0_image_10.png](0_image_10.png)

p R

![0_image_1.png](0_image_1.png)

![0_image_2.png](0_image_2.png)

N
N

should

![0_image_16.png](0_image_16.png)

![0_image_11.png](0_image_11.png)

![0_image_12.png](0_image_12.png)

![0_image_13.png](0_image_13.png)

![0_image_14.png](0_image_14.png)

![0_image_15.png](0_image_15.png)

