Numerous jet fuel monitoring facilities for buried doublewallpipe systems dating from the late 1980's to the present.
的翻译是:许多航空燃油监测设施的双墙埋管系统可追溯至1980年代后期到现在。
3
Analysis was made of several factors leading to occurrence of decomposition in production of PVC-U double-wall corrugated pipe and some manufacture experience was introduced.