1.Gas pipelines must avoid:
1.燃气管道必须避免:
2.Weld inspection is:
2.燃气焊缝检测比例:
3.Hot work requires:
3.动火作业必须:
4.Before testing:
4.燃气试验前必须:
5.First step in gas leak is:
5.燃气泄漏处理第一步是:
6.System testing purpose is:
6.系统测试目的:
7.Insulation test time is:
7.保温测试时间为:
8.System integration test is:
8.系统联动测试时间为:
9.Insulation material NOT include:
9.保温材料不包括:
10.Class A material is:
10.A级防火材料是: