orifice spillway tunnel 孔板泄洪洞
wind tunnel speed orifice 风洞测速孔
spillway tunnel with orifice 孔板泄洪洞
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In the process of emergency gate shutting in an orifice tunnel, big noise and strong vibration would be observed within the mid gate chamber.
在泄洪洞事故闸门动水下门过程中，洞内可能产生巨大的噪音和强烈的振动。
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