药物治疗指数是指( ) A. ED 50 /LD 50 B. ub> B.ED 95 /LD 5 C. ED 90 /LD 10 D. LD 5 /ED 95 E. LD 50 /ED 50 F. ub>A G. ub> H. 骨折时应用镇痛药吗啡属于( ) I. 预防用药 J. 对症治疗 K. 支持治疗 L. 对因治疗
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