题型:问答题 It was such a ________to hear that her son was found safe and sound in the forest.A.easeB.assistanceC.comfortD.relief 查看答案
题型:问答题 硝酸甘油通过下列哪个作用产生抗心绞痛效应?A.心肌收缩力减弱B.心率减慢,心脏舒张期相对延长C.扩张小动脉、小静脉和较大的冠状血管D.扩张小静脉,外周阻力降低E.扩张小动脉,回心血量减低,心室容积减少,心肌耗氧量降低 查看答案