题目内容

营养心的血管(左、右冠状动脉)是从()。

A. 主动脉升部中段发出的成对的血管
B. 主动脉升部起始处发出的成对的血管
C. 直接从左心室发出的成对的血管
D. 直接从右心室发出的成对的血管

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