51.抑制劑與受質(substrate)的結構類似時，抑制劑以下列那一種方式抑制酵素作用？ (A)競爭型抑制(competitive inhibition) (B)非競爭型抑制(noncompetitive inhibition) (C)不競爭型抑制(uncompetitive inhibition) (D)不可逆型抑制(irreversible inhibition)