定价： 910元 / 折扣价： 774 元

定价： 3640元 / 折扣价： 3094 元

1. Scope 1.1 This Standard is intended for the performance rating of factory-assembled unitary heat pumps, that are intended for use in direct-expansion (DX) ground-source heat pump systems. 1.2 Within the scope of the Standard, DX heat pumps are cl

定价： 546元 / 折扣价： 465 元

定价： 455元 / 折扣价： 387 元

定价： 1001元 / 折扣价： 851 元

定价： 501元 / 折扣价： 426 元

定价： 546元 / 折扣价： 465 元

定价： 910元 / 折扣价： 774 元

定价： 910元 / 折扣价： 774 元

1 Scope 1.1 This Standard applies to single- and 3-phase dry-type transformers, including those with cast or resin encapsulated coils, that are within the limits of the electrical ratings listed in Clauses 7.2 and 7.3, and that are intended for use in a

定价： 683元 / 折扣价： 581 元

1. Scope 1.1 The provisions of this Standard apply to electrically operated single- and multiple-station carbon monoxide (CO) alarming devices, hereafter referred to as devices, intended for protection in ordinary indoor residential areas. These areas in

定价： 2275元 / 折扣价： 1934 元

Update No. 1 was published as notification that this is now a National Standard of Canada This PDF includes Update No. 1 Preface This is the second edition of CSA A123.16, Asphalt-coated glass-base sheets. It supersedes the first edition, publis

定价： 592元 / 折扣价： 504 元

Update No. 1 was published as notification that this is now a National Standard of Canada This PDF includes Update No. 1 1 Scope 1.1 This Standard deals with asphalt-coated roofing sheets composed of asphalt-saturated organic felt coated on one o

定价： 592元 / 折扣价： 504 元

Update No. 1 was published as notification that this is now a National Standard of Canada This PDF includes Update No. 1 A165.1-04 Concrete block masonry units 1 Scope This Standard applies to concrete block masonry units made from cementitiou

定价： 637元 / 折扣价： 542 元

定价： 1138元 / 折扣价： 968 元