单项选择题

锅炉燃烧系统包括室燃烧和层燃烧。（）

A．对
B．错

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When the temperature is high enough, the carrier concentration produced by the intrinsic excitation will be greater than the impurity ionization, so the diode has the highest working temperature. When the ambient temperature is higher than this temperature, the diode cannot work normally. ()

答案：正确

单项选择题

A、正确
B、错误