TDT (Token-and-Duration Transducer):
The tests used in standards for evaluating smoke alarms were developed back in the 1980s. However, despite changes in building materials since then, smoke alarms remain reliable, says Chagger: "They still respond to all the main fires we get today."
，详情可参考搜狗输入法2026
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Step 1: Connect to the Hierarchy (Your Local Area):