youqichuyun
管道英语- 沉默是金的日志油气储运网
2012年6月4日 ... 6 管道支吊架 Pipe Supports and Hangers.. 31 · 7 应力计算. ...... 环头螺检 eye bolt 沉头螺栓 ... 松紧螺旋扣（花篮螺丝） turnbuckle ..... 符号 symbol
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