【单选题】【消耗次数：1】
下列不属于常用防腐剂的是（ ）。
①
羟苯酯类
②
山梨酸
③
苯扎溴铵
④
山梨醇
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【单选题】
关于单硝酸异山梨醇酯性质的说法，错误的是（）。
①
比硝酸异山梨醇酯的半衰期长
②
比硝酸异山梨醇酯更易进入中枢系统
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受热或受撞击容易爆炸
④
比硝酸异山梨醇酯的活性弱
⑤
是硝酸异山梨醇酯的体内活性代谢产物
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