Unplasticized PVC ringed pipes.Natural ageing test.
/规范英文名: Agricultural drainage.
Unplasticized PVC ringed pipes.Natural ageing test.
/规范英文名: Agricultural drainage.
gate valves with inside screw stem;
英文题: (Unplasticized polyvinyl chloride (UPVC) valves;
声明:以上例、词性
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