?Power system related work, including design, installation, repairing, maintenance; and other kinds of service such as setting up charging and accruing system of electricity fee, providing management and services of electrical and mechanical installation;
?Consultation, design, installation, supervision, construction and repairing of firefighting system;
?technical consultation, design, installation, supervision and repairing of water supply & drainage in civil buildings, as well as sanitary sewage and industrial drainage system;
?research, design, installation, repairing of electrical and mechanical units;
?consultation, design, supervision, installation, testing, repairing of boiler system such as blower, pumping, valve, methane gas, natural gas, LPG; as well as air-conditioning, ventilation, dry system;
?consultation, design, supervision, installation, testing and repairing of elevator, escalator and lifting equipment;
?Consultation, design, supervision, installation, test and maintenance of intercom system, internal data system, internal television system, intercommunication system and internal monitoring system.