主动脉粥样硬化形成的主动脉瘤最常见于（）
A.冠状动脉开口处
B.肾动脉开口处
C.主动脉弓
D.降主动脉
E.腹主动脉
参考答案：E
“thanks” is polite when someone has done you a favour, but saying it too often is quite another thing.
A．Though saying
B．If saying
C．Saying
D．In spite of saying
凡输送介质温度大于（）的离心泵，均应设暖泵管线。
A、100℃
B、150℃
C、200℃
D、250℃
