人人干人人艹,国内精品久久久久影院免费,国产麻豆一精品一AV一免费,亚洲天堂精品99

DEVELOPMENT HISTORY OFALUMINUM ALLOY FORMWORK

In the late 60s of last century. the construction project of Toronto, Canada entered the peak period, the destruction of environmenta resources artificial gradually rise, a number of construction companies in trouble. How to solve the existing environment, reduce costs, improve efficiency, become an urgent problen facec by construction companies; Aluma formwork company required urgen market developec by Aluminum Alloy template as the mair material template system, and obtained the unprecedented success, widely used in Hongkong anc Macao; China in more thar ter years ago has begun the use o Aluminum Alloy template, neighbouring Vietnam has started five years ago in the use ofAluminumAlloy template.

EVOLUTIONARY HISTORY OF BUILDING TEMPLATES