解磷定治疗有机磷中毒的机制（）

A.使胆碱酯酶恢复活性，消除或减轻烟碱样症状

B.解除有机磷中毒的毒蕈碱样症状

C.与有机磷结合排除体外

D.使有机磷氧化还原成无毒物质

E.以上都不是

A 3-year-old child with Down syndrome is admitted to the pediatric unit with asthma. The child doesn't enunciate words well and holds onto furniture when he walks. The nurse should ask the mother

A．how long the child has been like this.

B．if the child can walk without holding onto furniture.

C．how the child's condition today differs from his normal condition.

D．if the child always drools.