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.
此外，在盧旺達與剛果民主共和國之間，兩國在華盛頓簽署和平協議後仍爆發戰鬥。
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