要对管道元件进行强度计算，首先就要确定管道材料的许用应力。
If the strength calculation of piping components is to be made, the allowable stresses of the piping materials shall be determined fist.
公司完全能满足压力管道元件和安全附件的生产制造、试验检测的相关要求。
The company completely satisfies production manufacture and test check related requirements of pressure piping components and safety accessories.
安装，检查，更换或修理电线，插座，开关箱，管道，馈线，光纤和同轴电缆组件，照明灯具和其他电器元件。
Install, examine, replace or repair electrical wiring, receptacles, switch boxes, conduits, feeders, fibre-optic and coaxial cable assemblies, lighting fixtures and other electrical components.
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