第24题: [单项选择]Pig iron, wrought iron, and steel contain iron carbides made up of ______ of carbon. A. amounts are different B. different amounts that C. different amounts D. which amounts are different 参考答案:C
第29题: [单项选择]6岁女孩,胸骨左缘3~4肋间3/6级收缩期杂音,肺动脉第2音亢进,胸片示左右心室扩大。应诊断为() A. 室间隔缺损 B. 房间隔缺损 C. 动脉导管未闭 D. 肺动脉狭窄 E. 法洛四联症 参考答案:A 答案解析:缺损较大时左向右分流量多,体循环流量相应减少,患儿多生长迟缓,体重不增,有消瘦、喂养困难、活动后乏力、气短、多汗、易患反复呼吸道感染,易导致充血性心力衰竭等。有时因扩张的肺动脉压迫喉返神经,引起声音嘶