以下为句子列表：
英文: The FCR/PCR regulators offer maximum control and fuel efficiency on applications involving preheated air to the burners, or where burners are firing against varying back pressures.
中文: PCR调节阀具有最好的控制性能和最大的燃油效率，应用领域包括炉头预热空气，或者燃烧炉头工作在炉内压变化很大的情况下。
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