The unit casing shall be air tight at low and high pressure, units to be installed open to weather shall be weather proof type.
部件的层面在低压和高压下应具有气密性。安装在室外的部件应具有耐候性。
The unit casing shall be air tight at low and high pressure, units to be installed open to weather shall be weather proof type.
部件的层面在低压和高压下应具有气密性。安装在室外的部件应具有耐候性。
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