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?8502.In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases?

发布于 2021-02-18 22:11:06

【单选题】
A ?Either a combustion air relief valve or a differentia!
B ?pressure regulator.
C ?Only a differential pressure regulator can be used.
D ?Only a combustion air relief valve can be used.

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石头 2023-02-18

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