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给排水资料库
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常用电话英语 与大家交流常用电话英语1(1)要找的人不在a: Hello, This is carol. May I speak to Miss Chen?b: Yes, one moment please. I’ll get her for you.a: Thank you.b: I’m sorry, she’s not at her room right now.a: Oh, I’ll call her again.
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只看楼主 我来说两句雨水 Storm Sewer
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发泡管PVC-U pipe with a cellular core
预应力水泥管prestressed concrete pipe
双壁波纹管corrugated pipe with double sides
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