普萘洛尔没有下列哪种作用()。
A.减弱心肌收缩力
B.松弛支气管平滑肌
C.收缩血管
D.降低心肌耗氧量
E.减少肾素释放
参考答案:B
血液粘度与下列哪种有关()
A.血细胞比容
B.血浆中纤维蛋白原
C.血浆中球蛋白
D.血管内壁和血液动力学因素
E.以上都是
Fifteen years have passed since we graduated from the middle school.I have found she has______.
A.some white hair
B.much white hair
C.a few white hairs
D.a little white hair