上课把女同桌内裤摸湿,一线高清视频在线观看www国产,色综合伊人色综合网站下载,男人边吃奶摸下边免费视频,精品综合久久久久久蜜月

【Scope of application】

Used to determine the water permeability of plastic drainage boards. The length of the sample is 330mm, the thickness of the latex film is 0.3mm, and the pressure of 350Kpa is applied to the sample as required.

【technical parameter】

1. Sample length: 440 mm

2. Water head difference: 200mm, hydraulic gradient 0.5

3. The effect and the stress above the sample are: 0～500kPa

4. The thickness of the latex film is 0.3mm

5. Dimensions: 750×700×1920mm

6. Weight: 80kg