They are employed by heating systems installation and service companies.

他们受雇于加热系统安装和服务公司。

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A combination of over four years of work experience in the trade and some college or industry courses in heating systems installation and repair is usually required for trade certification.

通常需要四年的行业内工作经验，和大学或供暖系统的安装和维修行业的课程组合，才有资格获得行业认证。

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Remo is developing a clean growth plan that includes environmental regulations that will require the installation of such systems.

Remo 正在制定一项促进清洁计划，其中包括需要安装此类系统的环境法规。

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In 1996, I believe, the Saudis executed four individuals for an attack on a U.S. military systems installation in Riyadh, Saudi Arabia.

CNN: Lowell Bergman: How Saudi Arabia figures into the war on terror

The facility in Jacksonville will perform pre-equipping, mechanical assembly, structural assembly, systems installation and testing, and flight testing of A-29 aircraft, Embraer said.

FORBES: Move up http://i.forbesimg.com t Move down

Comfort Systems offers installation, maintenance, repair and replacement services for heating, ventilation, and air conditioning (HVAC) systems in the mechanical services industry.

FORBES: Comfort Systems Gains Momentum