Jim Lovell, Fred Haise and Jack Swigert are rescued from the Pacific Ocean after their dramatic escape
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.，详情可参考旺商聊官方下载
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requirements often included additional card punches and readers for data entry,
‘Overall we are moving in the right direction’