电动平衡车

电动平衡车，又称体感车（如图甲），是一种时尚代步工具．它利用车体内部的陀螺仪和加速度传感器，来检测车体姿态的变化，并利用伺服控制系统，精确地驱动电机进行相应的调整，以保持系统的平衡．电动平衡车采用站立式驾驶方式，通过身体重心和操控杆控制车体运行，采用锂电池组作为动力来源驱动左右两个电动机行驶，下表为某品牌电动平衡车部分技术参数，能量密度是指电池单位质量所输出的电能．

将8.1g氧化锌固体放入100g稀硫酸中，恰好完全反应．试计算：

①可生成硫酸锌多少克？

②所用稀硫酸的溶质质量分数是多少？

（化学方程式：ZnO+H₂SO₄=ZnSO₄+H₂O）

阅读下面短文, 按照句子结构的语法性和上下文连贯的要求, 在空格处填入一个适当的词或使用括号中词语的正确形式填空。

    Itzhak Perlman is ____ famous violinist. He was born ____ 1945. He once gave a concert in New York City. Getting on stage was difficult for him ____ he is disabled. The audience sat ____ (quiet) while he made his way across the stage to ____ (he) chair. Then he picked up the violin, ____ (put) it under his chin (下巴) and started to play. But this time, when he finished the ____ (one) part, one of the ____ (string) on his violin broke. ____, he continued to ____ (play) the music. The music he played with three strings sounded even more wonderful than it was played with four strings.