简述旧石器的制作技术。
参考答案：
（1）选择原料；
（2）打击石片；
（3）加工休整。
我厂Ⅲ组罐冷凝水流程是怎么样的？
The nurse is interviewing the mother of a 7-year-old child. Which of the following symptoms reported by the mother would most lead the nurse to suspect that the child has type 1 diabetes（）
A. Recent bed wetting.
B. Poor appetite.
C. Weight gain.
D. Boundless energy.
