单项选择题
A.S-腺苷蛋氨酸B.甲硫氨酸C.胸腺嘧啶D.同型半胱氨酸
A.支气管动脉B.胸主动脉C.胸廓内动脉D.肺动脉E.肺静脉
A.responsibleB.responsiblyC.responsibilityD.response