问题
单项选择题
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.
答案
参考答案：A
解析：
Chest physiotherapy aids in loosening secretions in the entire respiratory tract. Pancreatic enzymes aid in the absorption of necessary nutrients--not in managing secretions. Oxygen therapy doesn't aid in loosening secretions and can cause carbon dioxide retention and respiratory distress in children with cystic fibrosis. A high-calorie diet is appropriate but doesn't facilitate respiratory effort.
NH3 (g) + HI( g) ; ②2HI(g)
H2(g) +I2(g)达到平衡时，c(H2) =0.5mol·L-1， c( HI)=4mol·L-1，则此温度下反应①的平衡常数为 [ ]