工业保养涂料 industrial maintenance coatings
城镇企业职工养老保险 pension accounts for workers of urban enterprises
基础工业的保养系统 maintenance systems in basic industries
安装，维修和保养住宅，商业或工业管道装置和系统。
Install, repair and maintain domestic, commercial or industrial plumbing fixtures and systems.
燃气装配工安装，检查，维修和保养住宅，商业和工业机构的天然气管道和燃气设备，如仪表，稳压器和供热单位。
Gas fitters install, inspect, repair and maintain gas lines and gas equipment such as meters, regulators and heating units in residential, commercial and industrial establishments.
管道工安装，维修和保养管道，装置和用于住宅，商业和工业建筑的配水和废水处理等水暖器材。
Plumbers install, repair and maintain pipes, fixtures and other plumbing equipment used for water distribution and waste water disposal in residential, commercial and industrial buildings.
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