自拍偷拍第一页,日本涩导航,狠狠狠狠狠狠狠狠狠狠狠狠狠操 ,综合色色吧网

The news: ?To avoid fire hazard smoke impacts in evacuating persons in long interval in subway, normally, technical scheme of setting up air shaft above ground corresponding to subway interval was applied, and this measures wasn’t suitable for the subway tunnel where underwater running through the whole section (e.g. river). To overcome traditional ventilation and smoke discharge shortage in long interval, engineers from heating and ventilation office, innovated boldly with design experience, to propose new practical measures to suit the “l(fā)ongitudinal air passage of ventilation structure in long section of subway” where through water exists, and to apply for the patent –. Recently, the patent was authorized and issued.

This patent technology attributes to many years creation and accumulation of heating and ventilation technology, and has advantages like simple, practical, convenience, better economical, stronger application value and broad development prospect.