为提高发动机转速的均匀性，常采用以下两种方法：一个是在曲轴上安装（）；另一个是采用（）结构。
参考答案：飞轮；多缸
Li Na has won the championship in France Tennis Open. All the Asians her challenging sprint and excellent English.
A. are proud of B. take care of C. get along with
