两餐之间的时间间隔以4小事为宜。儿童每次进餐时间不应少于（）分钟．
参考答案：20-30
表达式2*4^2-2*6/3+3\2的值是 【6】 。
The nurse is caring for a woman with phenylketonuria who wants to start a family. Which of the following guidelines should the nurse provide the woman（）
A. Follow a low-phenylalanine diet before trying to conceive.
B. A low-phenylalanine diet is necessary only during the first trimester.
C. Begin a low-phenylalanine diet when pregnancy is confirmed.
D. Dietary restrictions won’t be necessary.
