冠状动脉周期性血流减少(CFRs)是Folts模型中一种特有..
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...系阻燃剂系列，这些含卤阻燃剂材料在燃烧时产生二恶英，且在环境中能存在多年，甚至终身累积于生物体，无法排出;氯化阻燃剂(CFRs)主要包括氯化石蜡、五氯硬脂酸甲酯、含氯增塑剂，氯系增塑剂等。
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There are now 32, with 207 CFRs providing 24-hour cover, seven days a week.
BBC: NEWS | Health | Volunteers boost ambulance crews
CFRs go through a formal selection process, which involves completing an application form and an interview to test their suitability for the job.
The volunteers, who are known as community first responders (CFRs), are mobilised by ambulance control and although they often arrive ahead of the paramedics, an ambulance is always automatically despatched to any call attended by them.
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