单项选择题 What is the most important role of the chants of Baduanjin？

单项选择题 血小板低于（）乘以10的9次方时应绝对卧床休息

未知题型 In the recovery movement ,the posture should be done in a peaceful posture, relaxed body, natural breathing, sighing Dantian, and restoring to a quiet state before practicing.