1.1 Scope 1.1.1 This standard applies to newly-produced direct gas-fired circulating heaters (see Part IV, Definitions) of 400,000 Btu (117 228 W) or less, hereinafter referred to as heaters, constructed entirely of new, unused parts and materials an

定价： 4368元 / 折扣价： 3713 元

1. Scope 1.1 This Standard applies to the computer-aided preparation of building working drawings. In general context, it establishes detailed recommendations on symbols and their application for computer-aided design drafting (CADD) for the building

定价： 774元 / 折扣价： 658 元

1. Scope 1.1 This Standard gives minimum requirements for ventilators designed to provide ventilation of building spaces by means of the natural flow of air. 1.2 This Standard includes physical, performance, and marking requirements. It also incl

定价： 364元 / 折扣价： 310 元

1. Scope 1.1 This Code covers the requirements for equipment, preparation and methods of weld process control, inspection and testing, used in resistance welding of components or assemblies which form part of a structure which is designed to carry cal

定价： 364元 / 折扣价： 310 元