一般情况下材料的价格差异，应由采购部门负责；材料的数量差异，应由负责控制用料的生产部门负责。
参考答案：对
已知函数y=lg（ax2+2ax+1）：
（1）若函数的定义域为R，求a的取值范围；
（2）若函数的值域为R，求a的取值范围．
A parent group is discussing different types of punishment. The parents ask the nurse to discuss corporeal punishment. What would be the nurse’s response()
A. "Corporeal punishment does not physically harm the child. "
B. "Corporeal punishment can result in children becoming accustomed to spanking. "
C. "Corporeal punishment can be beneficial in teaching children what they should do. "
D. "Corporeal punishment reinforces the idea that violence is not acceptable. \
