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There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.。爱思助手下载最新版本对此有专业解读
。关于这个话题，体育直播提供了深入分析
ITmedia �r�W�l�X�I�����C���ҏW�������삷���������[���}�K�W���ł�，这一点在体育直播中也有详细论述
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美以伊戰爭第四天焦點：以色列大規模空襲德黑蘭、貝魯特「軍事目標」