【单选题】【消耗次数：1】
个体防护装备的防护性都是有限的，防护原则（ ）。
①
对最危险的环境提供最安全的防护
②
首先有效控制危害源，让毒物不继续扩散
③
让暴露者全部迅速离开事件危险环境或隔离疏散
④
最大限度减少毒物损害
参考答案：
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