唐氏综合征患儿染色体核型标准型为
A. 46,XX,-14,+t(14q2l q)
B. 47,XX,+21
C. 45,XX,-14,-21,+t(14q21 q)
D. 47.XXX
E. 46,XX,-21,+t(2:lq21q)
A.concludedB.reachedC.receivedD.conducted
A. concluded
B. reached
C. received
D. conducted
有机磷农药中毒的发病机制主要是有机磷抑制了
A. 胆碱酯酶
B. 6一磷酸葡萄糖脱氢酶
C. 细胞色素氧化酶
D. 糜蛋白酶
E. 乳酸脱氢酶