问题
单项选择题
关于围术期心肌缺血下列哪项是正确的？
A．ST 段抬高往往为心内膜下缺血所致
B． ST 段降低往往提示透壁性缺血
C．多巴酚丁胺既可以增加耗氧又可以减少耗氧
D．室壁张力与左心室半径呈反比
E．心脏射血时的阻力主要来自前负荷
答案
参考答案：C
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关于围术期心肌缺血下列哪项是正确的？
A．ST 段抬高往往为心内膜下缺血所致
B． ST 段降低往往提示透壁性缺血
C．多巴酚丁胺既可以增加耗氧又可以减少耗氧
D．室壁张力与左心室半径呈反比
E．心脏射血时的阻力主要来自前负荷
参考答案：C
| 用方框内所给词的适当形式填空。 | |
didn't know how to cook it. So she asked the shopkeeper 2______ down the way of cooking on a piece of paper. Then she put the paper 3______ her pocket and left the shop happily with the fish. On her way home, a white cat took the fish away from her and ran away at once. Mrs. Zhang ran after the cat 4______ she couldn't catch it. But suddenly she remembered 5______ and laughed. She shouted to the cat loudly,"You don't know how to cook the fish. The paper is still in my pocket!" |