Which of the following would be most important to teach a client older than 65 years to prevent a recurrence of bacterial pneumonia

A．Change current diet habits.

B．Seek prompt antibiotic therapy for viral infections.

C．Receive prophylactic antibiotic therapy.

D．Obtain annual influenza and pneumococcal vaccines.

主体结构按照施工质量验收层次划分属于（）。

A.分项工程

B.检验批

C.分部工程

D.单位工程