a manhole cover.
出入孔盖。
a manhole cover.
出入孔盖。
he lifted the manhole cover and peered into the depths beneath.
他掀起窨井盖向下面深处望去。
inspectors can lamp the lines between the manholes for routine maintenance observations.
检查员能够照亮检修孔之间线路进行日常维修
。
Body has handhole (or manhole) for easy wash and examination, And bottle valve set up inlet/outlet valve,safety valve, pressure gauge and pressure gauge valve, drain valve etc.
体上设有手孔(或人孔),以便清理、检修。瓶头阀上设有进气阀、出气阀,安全阀、压力表和压力表阀、泄放阀等。
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