【简答题】A.She asked for $15. B.She donated $50. C.She requested $20. D.She gave $10.
【简答题】观察(1)tan10°tan20°+tan20°tan60°+tan60°tan10°=1 (2)tan5°tan10°+tan10°tan75°+tan75°tan5°=1 由以上两式成立,推广到一般结论,写出你的推论______.
【单选题】2低温控制轧制获得更细小的铁素体晶粒(可以达到( )μm,相当于ASTMNo12级),使热轧钢板的综合机械性能、尤其是低温冲击韧性有明显的提高。
【简答题】A.She applied for a science scholarship and asked for help from her friends. B.She applied for a music scholarship and asked for help from her parents. C.She hasn't thought about this problem. D.She n...
【简答题】Which of the following is NOT mentioned in the passage?