The flowers in the vase withered because they had no water.
A. became sweeter
B. became red
C. became dry
D. became wet
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Just for fun, they decided to try a very circuitous country road instead of the more direct highway.
A. straight
B. flat
C. direct
D. indirect
心衰最特征性的血流动力学变化是（）
A.肺动脉循环充血
B.动脉血压下降
C.心输出量降低
D.毛细血管前阻力增大
E.体循环静脉淤血
心衰时心肌收缩性减弱，与下列哪一项因素无关（）
A.ATP供给不足
B.肌细胞死亡
C.肌浆网Ca2＋摄取能力下降
D.肌浆网Ca2＋释放能力下降
E.肌钙蛋白活性下降
下列哪一项因素与心室舒张功能障碍无关（）
A.甲亢症
B.心室舒张势能减弱
C.心肌顺应性降低
D.心室僵硬度加大
E.肌浆网Ca2＋释放能力下降
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