Plastics piping and ducting systems . thermoplastics pipes . determination of resistance to external blows by the staircase method 塑料管和防护管系统.热塑管.用梯级法测定抗外冲击应力的能力
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Plastics piping and ducting systems - thermoplastics pipes - determination of resistance to external blows by the staircase method 塑料管和导管系统.热塑性塑料管.用梯级法测定抗外部冲击性能
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Plastics piping and ducting systems - thermoplastics pipes - determination of resistance to external blows by the staircase method ; german version en 1411 : 1996 塑料管和管道系统.热塑塑料管.梯级法测定抗外冲击应