第9题: [单项选择]Why is Mrs. Smith reluctant to grant the request A. She is busy dealing with her own problems. B. She finds it hard to communicate with George. C. She doesn’t think George is an asset to the company. D. It is not the first time that George has made this request. 参考答案:D
第26题: [单项选择]法洛四联症患儿于行走时喜欢下蹲片刻再走,主要是因为该动作可() A. 减少组织耗氧 B. 使心脑供血量增加 C. 缓解漏斗部肌肉痉挛 D. 使腔静脉回心血量减少 E. 使体循环阻力增加,使右向左分流减少 参考答案:E 答案解析:蹲踞为一种无意识的自我缓解缺氧和疲劳的体位。蹲踞时下肢受压,体循环阻力增加,使右向左分流减少,肺循环增加,同时下肢屈曲,使静脉回心血量减少,减轻了右心室负荷,使右向左分流减少,从而使缺氧症状暂时得以缓