GB 50242-2002 第11.2.4条
| **** | The indoor drainage system shall undergo a ball-passing test. The ball diameter shall be no less than 2/3 of the drainage pipe diameter, and the ball-passing rate must reach 100%. |
| **** | The indoor drainage system shall undergo a ball-passing test. The ball diameter shall be no less than 2/3 of the drainage pipe diameter, and the ball-passing rate must reach 100%. |
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