题目内容

第三心音听诊特点为

A. 音调较高而脆，历时约0.08秒，在心底部最响
B. 音调较低钝，强度较响，历时约0.1秒，在心尖部最响
C. 音调低，沉浊而弱，在心尖部及其内侧较明显
D. 音调低钝而重浊，持续时间约0.04秒，在心尖部及其内上方于仰卧位较清楚
E. 高调清脆而短促，在心尖部听诊最清楚

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