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2. 排序：将堆顶(最大值)与末尾交换，堆大小-1，重新调整堆
，这一点在快连下载安装中也有详细论述
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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."