The structure and principle of the toilet drain valve need not be repaired after it is broken

The structure and principle of the toilet drain valve need not be repaired after it is broken

[@nickyu8884]

可以直接講一下怎麼調節，比如說，調上是省水還是費水，這樣就好

[@zhang1982dc]

谢谢分享，讲解明白，通俗易懂，受益了

[@wtch7510]

不明白

[@user-mz5dw1gl8z]

很認真的教學，但越聽越糊塗，主要是本人理科很差😢