另类视频区第一页_ai777.国产精品影院_国产高清在线精品一区等最新內容_草草草草久久综合视频_国产免费网站看v片在线高清_久久自慰喷水流白浆网站_99精品国产免费_AV高潮喷吹在线观看_好硬～好爽～别进去～嗯视频_无码色偷偷亚洲国内自拍_久久久久久一级毛片免费 _四虎精品无码AV电影_成在人线AV无码免费高潮喷水_国产精品9在线观看_免费看18禁止观看黄网站


Promise one

For full-rotation casing, the casing joint group breaks within 50 meters of buried depth during use. If the casing cannot be taken out, the buyer will refund the total amount of the casing for the purchase of the casing.

Promise two
For the rotary digging casing, the supplier is responsible for guiding the construction of 1-2 piles into piles on site. The buyer shall strictly follow the specific operating procedures during operation and use. If all consequences caused by improper operation, the buyer shall Responsible.
The supplier shall be responsible for the fracture of the casing and the deformation of the casing joint during use.