该参考指南包含这些配件和系统的设计、制造、安装和操作方面。
The guidelines include aspects relating to the design, manufacture, installation, and operation of such fittings and systems.
该参考指南包含这些配件和系统的设计、制造、安装和操作方面。
The guidelines include aspects relating to the design, manufacture, installation, and operation of such fittings and systems.
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