硝酸酯类药物舒张血管的作用机制是______。
A.阻断β受体B.直接作用于血管平滑肌C.促进前列环素的生成D.释放一氧化氮E.阻滞Ca2+通道
参考答案:D
.I was about to leave_________I saw him_______ towards me, with a bag in hand.
A.while; running
B.when; running
C.as; ran
D.when; to run
易侵犯面神经
A.结核性脑膜炎B.病毒性脑膜炎C.隐球菌脑膜炎D.化脓性脑膜炎E.中毒性脑病