paper: “plain smooth surface”
Thinking Step 1: 分析题目条件。“你们都要”意味着 A AND B AND C = True。
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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.
16:51, 27 февраля 2026Экономика
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