[单项选择]胡桃夹综合征二维声像图特征是:①左肾静脉狭窄前扩张部位近端内径比狭窄部宽>2倍②右肾静脉狭窄前扩张部位近端内径比狭窄部宽>2倍③脊柱后伸位15~20min后,左肾静脉受压明显,扩张部近端内径比狭窄部宽>4倍④脊柱前伸位15~20min后,右肾静脉受压明显,扩张部近端内径比狭窄部宽>4倍 A. ①③ B. ②④ C. 以上各项均不是 D. 以上各项均是
第31题: [单项选择](That) the woman (was saying) was so important that I asked everyone (to stop) talking and (listen). A. That B. was saying C. to stop D. listen 参考答案:A 答案解析:改为What,从逻辑意义上讲what就相当于the thing (s) that。