问题
问答题 简答题
周期性动作系统的主要结构特点是什么？
答案
参考答案：
以周期性循环的规律出现的动作组合为周期性动作系统，其结构特点为：
（1）动作的反复性和连贯性。
（2）动作的节律性。
（3）动作的交互性（四肢、左右）
（4）动作的惯性作用。
以上4点主要反映了周期性动作的空间特征、时间特征、运动学特征和动力学特征。
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周期性动作系统的主要结构特点是什么？
参考答案：
以周期性循环的规律出现的动作组合为周期性动作系统，其结构特点为：
（1）动作的反复性和连贯性。
（2）动作的节律性。
（3）动作的交互性（四肢、左右）
（4）动作的惯性作用。
以上4点主要反映了周期性动作的空间特征、时间特征、运动学特征和动力学特征。
A boy lost his arms in an accident and his father lost his life. Since then, he had to _ the arms of his younger brother. Except for writing with his toes(脚趾头), he could hardly do _ in his life. As the two brothers grew up together, they had lots of and they often argued . Then one day, his younger brother him. So he was very sad and didn't know to do. A girl lost her hands because of a fire. Though her elder sister wanted to her, she decided to be completely independent . At school, she always studied hard. Once she wrote the following in her composition, "I am . Though I lost my hands, I still have legs. Though my wings are broken, my heart can still fly." One day, the boy and the girl were both invited a television interview program. They both were asked to write something on a piece of paper with their toes. The boy wrote "My younger brother's arms are my arms" the girl wrote "Broken wings, heart".
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