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单选题
当通风空气温度升至27℃时，排气阀打开。
A
When the temperature of vent rises to 27℃, the exhaust pipe opens.
B
When the ventilation temperature is above 27℃, the drain mast opens.
C
When the temperature of the ventilation air increases to 27 °c, the discharge valve opens.
答案解析
正确答案：C
相关知识点：
通风温 27℃，排气阀打开
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