1. 下列标准中所包含的条文，通过在本标准中引用而构成为本标准的条文。本标准出版时，所示版本均为有效。所有标准都会被修订，使用本标准的各方应探讨使用下列标准最新版本的可能性。
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

2. 下述标准文件包含的条文，通过在本标准中引用而构成本标准的条文。若引用的标准文件标有日期，则在此日期以后对此引用标准文件的增补和修订均不适用于本标准。若引用的文件不标日期，则本标准应采用该引用标准文件的最新版本。
The following normative documents contain provision which, through reference in this text, consitute provisions of this national standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the lastest edition of the normative document referred to applies.

3. 下列文件对于本文件的应用是必不可少的。 凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本（包括所有的修改单）适用于本文件。
a) The following documents are necessary for the application of this document. For references dated, only their dated versions are applicable to this document. For references undated, their latest versions, including all amendments, are applicable to this document.
b) The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

4. 下列文件中的条款通过本标准的引用而成为本标准的条款。凡是注日期的引用文件，其随后所有 的修改单(不包括勘误的内容）或修订版均不适用于本标准，然而，鼓励根据本标准达成协议的各方研究 是否可使用这些文件的最新版本。凡是不注日期的引用文件，其最新版本适用于本标准。
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative documents referred to applies.