有机磷酸酯中毒时产生M样症状的原因是
A.胆碱能神经递质释放减少
B.胆碱能神经递质释放增加
C.药物排泄减慢
D.胆碱能神经递质破坏减慢
E.M受体的敏感性增加
参考答案:D
— Where is Miss. Wang?
— She went to Beijing last week and will be back six days. [ ]
A.ago
B.in
C.later
D.before
PCR-SSP序列特异性引物PCR