Air investigations are absolutely necessary before entering any manholes.
空气调查是绝对必要的，方可进入任何沙井。
This welding backing is specially designed for hand holes and manholes welding.
本衬垫适用于入孔，出孔得焊接使用。
Close all blind flanges, inspection holes and manholes.
关闭所有盲法兰盖，并检查各个孔和人孔。
Silt removal facilities, channels and manholes should be checked to ensure that they can function properly.
应检查淤泥清除设施、渠道及沙井，以确保运作妥当。
Interior surfaces of manholes and its covers should level with that of the container.
人孔及人孔盖的内表面与容器的内表面平齐。
Go through manholes to funnel deck.
由逃生通道到烟囱甲板。
Designed for high temperature requirements rebound parts of manholes, valves.
适应于高温要求回弹部位得人孔，阀门。
For example, you might be asked to determine how many manholes are in Manhattan.
例如, 你会被问到如何统计曼哈顿中的沙井盖数量。
Sanitary fittings, drainage pipes, manholes, sewage water quality, etc
卫生设备、排水渠、沙井、污水质量等
For manholes and sump pit locations and sizes refer to mechanical and electrical drawings.
对于检查孔及放空坑位置与尺寸, 参照机械图纸与电力图纸。
It involves manholes and endless ladders.
通过人孔和数不尽得梯子。
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