冬季儿童呼吸道疾病多发，其中流感病毒是常见的病原体之一。如何区分流感和普通感冒？流感典型症状有哪些，一般病程多长？哪些儿童发生重症的风险较高？今天，我们就家长朋友们最关心的问题，进行解答。流感有哪些典
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所谓炸炉是指玻璃在钢化炉内加热的过程中发生的炸裂，炸裂时伴有咔嘭声响。这是因为玻璃在消除原有应力的过程中，应力失衡所造成的，一旦发生炸炉如果处理不当就会造成很严重的果。因此，必须根据具体情况，采取相对
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