题目

在锐角三角形中，，角A，B，C的对边分别是a，b，c，则的取值范围为_______. 答案：() 听材料，回答1-3题。1. What is the machine used for?A. Cutting apples. B. Holding food. C. Cutting vegetables. 2. Where was it made? A. In Shanghai B. In Germany C. In Canada 3. How long has the woman had the machine? A. For 2 weeks B. For 2 days C. For 20 days