in japan, grace solar took the lead into japan market in 2009, participated almost 80% japan prefectures...mounting design experience and high quality product for this project. they have ensure the smooth progress
5.2.37附加压力 added pressure resistance due to elevation当燃气管道始末两端存在标高差值时,在管道中产生的额外压力。...8.4.6无压管道闭气试验 pneumatic pressure test for nonpressure pipeline以气体为介质对已敷设管道所做的严密性试验。