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(A)吸气时用鼻子吸气,呼气时嘴呈缩唇状缓慢呼气
(B)吸气时用口吸气,呼气时用口呼气,嘴呈缩唇状
(C)吸气时用口吸气,嘴呈缩唇状,呼气时用鼻子呼气
(D)吸气时用鼻子吸气,呼气时用鼻子呼气
(E)以上均不对