The nurse is caring for a client who has a history of alcohol abuse. Why would the client act as if he didn’t have a problem（）

A. The client has never taken the CAGE questionnaire.

B. Denial is a defense mechanism commonly used by alcoholics.

C. Thought processes are distorted.

D. Alcohol is expensive.

若氮气减压阀损坏不能及时更换，必须通过调节氮气入口压力不调节系统内的压力。