氯胺酮对心血管系统的作用与下列哪项因素有关()
A.降低α肾上腺素能活动性
B.抑制迷走神经
C.直接增强心肌收缩力
D.抑制血管运动中枢
E.提高颈动脉窦压力感受器
参考答案:B
临床确诊蛛网膜下隙出血的标准是什么?
It is in Oxford University________he studied for 4 years________he got his graduate student degree.[ ]
A.that;that
B.that;where
C.where;that
D.where;when