manhole n.人孔人孔;进人孔...ladder to manhole 人孔梯子...quick-opening manhole 快开人孔...quick opening manhole 快开人孔...inlet manhole 人孔入口...dome manhole 圆顶人孔...dome center manhole 储罐中部的人孔...manhole yoke 人孔栓...manhole with flat cover 平盖人孔...shell manhole 壳体人孔...cover plate for manhole 人孔盖板...manhole with sight glass 带视镜人孔...manhole cover 人孔盖...pipe manhole 管道检查井;管道检查孔...
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