This article introduces the basic operational steps and some common maintenance methods of multimedia projector.

介绍了多媒体投影机的基本操作步骤和一些常用的维护方法。

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Different methods of check, observation and repair necessity are given according to different cracks. The common maintenance methods are introduced.

针对不同的裂缝类型，提出检查、观测以及修补必要性的判断方法，并介绍了在日常养护中常用的维修方法。

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Common maintenance requires a great deal of effort, time, and coordination.

而一般的维护过程要花费大量的人力、时间和协调工作。

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The agreement includes plans for common maintenance and training on the A400M transport aircraft - which both countries are acquiring - and the possibility of France using the UK's air-to-air refuelling aircraft, when there is spare capacity and training.

BBC: Cameron and Sarkozy hail UK-France defence treaties

Many leases in the healthcare sector are long in duration and triple net, meaning the tenant is responsible for taxes, insurance, and common area maintenance fees.

FORBES: Health Care REITs Should Provide Durable Income in 2013

And because 80% of the parts were common to all three versions, maintenance and logistics would be simpler and cheaper.

ECONOMIST: The defence industry