题目内容：
测定血清酶活性时，标本采集要点错误的是A.采血后及时分离血清
B.大多数抗凝剂在一定程度上影响酶活性
C.大部分酶在低温中比较稳定
D.ALT冷冻保持10个月活性变化不大
E.LD在低温保存比在室温更稳定
参考答案：
选择题：测定血清酶活性时，标本采集要点错误的是
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