double untied expansion joint
... 单式万向铰链型膨胀节 single gimbal expansion joint 复式自由型膨胀节 double untied expansion joint 复式拉杆型膨胀节 double tied expansion joint ...
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multiple free expansion joint
... 波纹管膨胀节expansion*posed*rrugated pipe(s) 复式自由型膨胀节multiple free expansion joint 管道电绝缘pipeline electrical isolation ...
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