Subscription plans can be a bit pricey
"A lot of stately homes will have that system," says Niki Johnson, fire systems technical adviser for the UK Fire Association, a trade body, and owner of fire detection firm Derventio Fire and Security. "You could be looking at £3-4,000 just to do a corridor." Such installations require substantial pipework, he explains.，这一点在同城约会中也有详细论述
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paper card, often the same dimensions as a modern credit card, but with punched