Unverified50% confidenceDecision RuleTime unknown
燃气切断阀必须选择常闭型（NC，断电即关闭）而非常开型：常闭型在停电、报警器触发、故障时都会自动切断，符合失效安全原则；常开型断电时反而保持通气，存在安全隐患
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