油罐孔盖  tank hood

油罐人孔  tank manhole

半埋半覆盖油罐  cut-and-cover tank

测油罐油面上部空间高度的尺  outage tape

套筒式油罐罐体结构  shingled construction of tank

油罐孔口  tank hatch

油罐油面上部空间高度的测定  gauging by ullage; gauging by outage

油罐油蒸气生成率  tank’s vapor formation rate

油孔盖  oil well cover

油孔盖铰链盖  oil hole cover

便携式人孔盖  portable manhole cover

出入孔检修孔人孔  access hole

带螺栓的人孔盖板  bolted man hole cover plate

检查孔、人孔  inspection hole

铰链盖人孔  hinged manhole

铰链式人孔盖  hinged manhole cover

人孔盖  Scuttle; manhole cover; man hole cover; man hole door; Companion

人孔盖密封圈  manhole cover seal ring

铸铁人孔盖板  cast iron manhole cover