Some Math problems in this book are     difficult for the students       work out.

A．so, that

B．not, but

C．such, that

D．too, to

临床常用药物中毒的解救

静脉注射丙烯吗啡减轻呼吸抑制

A．解救苯妥英中毒
B．解救异烟肼中毒
C．解救巴比妥类中毒
D．解救卡马西平中毒
E．解救三环类抗抑郁药中毒