第4题: [单项选择]CT检查肺动脉栓塞造影时,对比剂延迟时间为 A. 开始注射对比剂后9~11s B. 注射与扫描同时开始 C. 开始注射对比剂后22~25s D. 开始注射对比剂后5s以内 E. 开始注射对比剂后23~40s 参考答案:A 答案解析:[解析] CT检查肺动脉栓塞造影时,注射对比剂后9~11s肺动脉显影。
第33题: [单项选择]What does the woman mean A. She didn’t like the books the man bought. B. There wasn’t a large selection at the bookstore. C. The man bought a lot of books. D. She wanted to see what the man bought. 参考答案:C 答案解析:[听力原文] M: I bought a few books at the new bookstore. Would you like to have a look at them W: