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.
Isaacman said the Artemis III docking in low Earth orbit could take place with one or both of the landers.
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An NHS England spokesman said the problem was affecting supply globally.，详情可参考WPS官方版本下载
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