GB/T 39806-2021悬空地板、踏步、步道及栈道玻璃安全性能评价标准
英文:Safety performance evaluation of suspended floor,stairs, trail and plank road glass GB/T 39806-2021介绍: 国家标准《悬空地板、踏步、步...
英文:Safety performance evaluation of suspended floor,stairs, trail and plank road glass GB/T 39806-2021介绍: 国家标准《悬空地板、踏步、步...