女性,35岁,二尖瓣狭窄,当失代偿期发生时,最初的症状是 | 听力短文题(Excuse me, could you)

单选题女性,35岁,二尖瓣狭窄,当失代偿期发生时,最初的症状是

A、咯血

B、腹痛

C、晕厥

D、心绞痛

E、劳力性呼吸困难

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