特殊用法branch manhole1.分歧人孔cable manhole1.电缆管道人孔cask manhole1.木桶人孔concealed manhole1.隐蔽孔dome manhole1.圆顶人孔dome center manhole1.储罐中部的人孔double manhole1.双人孔fan-shaped manhole1.扇形人孔flushing manhole1.冲洗(出入)人孔hinged manhole1.绞链盖人孔raised manhole1.凸起人孔sanitary sewer manhole1.污水管[下水道]检查井side-entrance manhole1.旁进式人孔sidewalk manhole1.人行道侧行人(升降)出入口; 人行道人孔straight-through manhole1.直通人孔sunken manhole1.平盖人孔tank manhole1.油罐[液舱]人孔turning manhole1.转弯人孔water pipe manhole1.水管井watertight manhole1.水密人孔