He didn't go home _______ he finished his homework. [ ]
A. when
B. if
C. until
D. that
答案:C
单室模型多剂量静脉注射给药稳定最大血药浓度公式().
A.A
B.B
C.C
D.D
E.E
下列不属于水体物理自净作用的是()
A.混合作用
B.沉淀作用
C.配位反应
D.絮凝作用