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【单选题】
有机磷毒物(农药和神经性毒剂)中毒主要原因是抑制ChE的活性,使ChE失去催化水解Ach的功能,造成体内Ach大量蓄积,导致神经系统的功能紊乱,引起一系列的中毒症状和体征。所以测定ChE活性是有机磷毒物中毒诊治的重要检查指标。一般ChE活性下降到正常值的百分之多少以下时,可出现中毒症状A.
10%
B.
20%
C.
70%
D.
100%
E.
50%
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