damping-bob for shaft plumbing
... 激光投点 laser plumbing 重锤投点 damping-bob for shaft plumbing 定向连接测量 orientation connection survey ...
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... damping vibration attenuation || 阻尼减振 damping-bob for shaft plumbing || 稳定锤投影 dampness || 湿度,潮湿 ...
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