This paper describes the functions, composition and key control techniques of PDS 1 power supply unit maintenance test bench.

简要介绍PDS 1型电源机维修测试台的功能，组成及关键控制技术。

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NE series plate chain bucket elevator is composed of upper section middle casing lower section moving members driving unit maintenance platform and hanging racks.

提升机由上部区段、中部机壳、下部区段、运行部件、驱动装置、检修平台和吊架组成。

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With the single unit capacity of small and medium hydropower growing increasingly and the complex of unit structure, so it put forward a higher demand about unit maintenance.

随着中小型水电机组的单机容量不断增加，机组结构日趋复杂，对机组的检修提出了更高的要求。

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Unit 2 had been taken offline earlier that month for maintenance, and investigators later found unexpected wear on hundreds of tubes inside both units.

NPR: Calif. Reactors Might Be Retired If Restart Nixed

As a result, the firm has taken measures to try to turn around the fortunes of the unit, including cancelling services on loss-making routes and streamlining some of its maintenance operations and cutting jobs.

BBC: Qantas: Boeing compensation boosts first-half earnings

The dome in Unit 4, however, was removed in November 2010 and the fuel removed for reactor maintenance and to add new fuel rods.

FORBES: New Video From Fukushima Shows Containment Vessel Dome Amid Debris