以下为句子列表：
英文: A Double Check Detector Assembly shall be installed on fire protection systems when connected to a potable water supply.
中文: 当消防系统连接到饮用水供应系统时，应该安装一个双止回阀总成。
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英文: Check detector seals, and replace as necessary. Clean or replace detector jets as necessary.
中文: 检查检测器密封垫，如有必要就替换。如有必要清洗或替换检测器喷嘴。
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英文: Series 007DCDA Double Check Detector Assemblies are designed exclusively for use in accordance with water utility authority on non-health hazard containment requirements.
中文: 系列007DCDA双止回阀检测总成专用于符合自来水主管部门非健康危害密封要求的应用场合。
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英文: Series 709DCDA Double Check Detector Assemblies are designed exclusively for use in accordance with water authority containment requirements.
中文: 系列709DCDA双止回阀检测器总成专用于满足水主管部门的密封要求的应用场合。
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英文: Series 774DCDA Double Check Detector Assemblies are designed for use in accordance with water utility non-health hazard containment requirements.
中文: 系列747DCDA双止回阀总成用于符合自来水公司非健康危害密封要求的应用场合。
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