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.
「其實我們講什麼，政府都不會保證一定會聽的。政府沒有說服或解釋，這份問卷具體的作用將會是怎樣。」
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The last week has been particularly tumultuous for Microsoft's gaming division. Former Microsoft Gaming CEO Phil Spencer announced his retirement on Friday, alongside the appointment of Asha Sharma, the President of Microsoft's CoreAI division, as his replacement. Opinions differ as to whether Sharma's new position will be good or bad for Xbox, but more changes are likely on the way.
The strike in England is due to last from 0700 GMT on Wednesday, 17 December until 0700 on Monday, 22 December.