Что думаешь? Оцени!
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.
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# What about other tools?，详情可参考同城约会
One of the most important changes will be whom Ellison names editor-in-chief, he adds, a selection that will set the tone for what follows.