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泰国喀威旺混凝土公司的卡江先生说：关键是成本和效益。喀威旺混凝土公司位于泰国首都曼谷市郊区，多年来一直为泰国的城市污水及雨水系统生产水泥管和混凝土预制箱涵。泰国７０年代以来的习惯做法主要是生产长度仅１米、采用水泥砂浆接头的平口管和箱涵。卡江先生与其夫人查?
Mr.Ka Jiang of Thailand Kwewwang concrete company said: The key is cost and benefit. Located on the outskirts of the Thai capital city of Bangkok, Kweweiwon Concrete Company has been producing concrete pipe and concrete box culverts for Thailand’s urban sewage and stormwater systems for many years. Since the 1970s in Thailand, the usual practice is to produce flat pipes and box culverts with a length of only 1 meter and using cement mortar joints. Mr.Ka JiangAnd his wife check?