问题详情

Quality management ensures that an organization,product or service is （1）.It has four main components:quality planning,quality assurance,quality control and quality （2）.

A.guaranteed

B.sustain

C.good

D.consistent@@@SXB@@@A.improvement

B.change

C.spiral

D.evolution

请帮忙给出正确答案和分析，谢谢！