硬膜外阻滞后血压下降合并心率减慢的原因有（）
A.心肌缺氧
B.交感神经阻滞
C.左心衰竭
D.迷走张力增加
E.术前用药的影响
参考答案：A, B
分别取某健康人的血浆、原尿和尿液进行成分分析,发现某种物质在尿液中没有、在血浆和原尿中都有且含量几乎相等,则该物质是( )
A．蛋白质
B．葡萄糖
C．水
D．尿素
The examination was coming, but she couldn't go to sleep easily. Thoughts ________ in and images
flashed into her mind. [ ]
A. crowded
B. broke
C. fitted
D. settled
