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绷劲练习。股四头肌等长收缩练习，因为不用移动下肢，不必活动关节，所以是一种非常安全的练习。同时力度的大小自己可以随时调节和控制，可以多用一点力，疲劳或者疼痛也可...

class go to as many people as possible before finding the ruler. However, the t...