Jgj231-2010 technical specification for safety of socket type coil buckle type steel pipe support in building construction China Construction Industry Press price: 12 yuan publication date: December 2012 if you need to know more about this book, or if you want to buy this book, please make a solemn statement by pressing the QR Code: all the books sold in this book city are genuine books authorized by all publishing houses, and the invoice shall be provided by all publishing houses
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