某单位购买具有“三证”和“一标志”的安全防护用品，这些物品必须经过（）验收，并对其防护功能进行必要的检查后，方可使用。_金属、支座、土工合成材料类_全学科试题题库

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某单位购买具有“三证”和“一标志”的安全防护用品，这些物品必须经过（）验收，并对其防护功能进行必要的检查后，方可使用。
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