58.有關partial agonist 的敘述，下列何者正確？ (A)partial agonist 對受體的binding affinity小於full agonist (B)partial agonist 對受體的intrinsic efficacy小於full agonist (C)partial agonist與full agonist一起合用時efficacy會相加成 (D)partial agonist較full agonist不易受拮抗劑的抑制