A client with a known history of opiate addiction is treated for multiple stab wounds to the abdomen. After surgical repair the nurse notes that the client’s pain is not relieved by the prescribed IM meperidine hvdrochloride(Demerol)injections. The nurse recognizes that the failure to achieve pain relief from the Demeroi injections indicates that the client is probably experiencing the phenomenon of()

A．Tolerance

B．Habituation

C．Physical addiction

D．Psychological addiction

ZnO法脱硫时，原料气的汽/气比增大，硫容量降低。