多项选择题
A.平静呼吸下屏气 B.平静呼吸不屏气 C.缓慢连续呼吸
A.1.5cm B.2cm C.2.5cm D.3cm
A.60° B.90° C.120° D.180°
A.5° B.10° C.20° D.35°
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