压力感受性反射的生理意义是
A．减慢心率
B．增加冠脉流量
C．降低平均动脉压
D．稳定快速波动的血压
参考答案：D
I finally got the job I dreamed about. Never in all my life so happy! [ ]
A. did I feel
B. I felt
C. I had felt
D. had I felt
扦插难生根树种最好用（）
A、硬枝扦插
B、嫩枝扦插
C、A、B均可
