久久高清超碰av热热久久,国产乱女婬AV麻豆国产,一級特黃色毛片免費看,国产成人一卡2卡3卡4卡

平面外墻金屬蓋板型ZKWQ-GB-P

轉(zhuǎn)角外墻金屬蓋板型ZKWQ-GB-L
 

Advantages:
 1.simple structure, low cost

 2. simple installation 

Disadvantages: only applicable to whose gap width  is under 70mm, not recommendable to those over 90mm