A 7-year-old boy is hospitalized with cystic fibrosis. To help him manage secretions and avoid respiratory distress, the nurse should （）.

A．perform chest physiotherapy every 4 hours.

B．give pancreatic enzymes as ordered.

C．place the child in an oxygen tent and have oxygen administered continuously.

D．serve a high-calorie diet.

展会的主办方一般会尽量把搭建展台的时间延长，主要是考虑搭好后的维护问题。