第25题: [单项选择]临床食管癌多见于哪一部分 A. 颈部 B. 胸部上段 C. 胸部下段 D. 胸部中段 E. 以上都是 参考答案:D 答案解析:食管癌胸部中段较多见,其次是下段,上段较少。
第26题: [单项选择]高效液相色谱法固定相 A. 塔板高度与流动相流速关系式 B. 流动相需要高压泵才能输送 C. 电场强度增大,分离趋于完全 D. 十八烷基硅烷键合硅胶 E. 甲基硅橡胶SE-30或OV-1 参考答案:D
第27题: [单项选择] Questions l4~16 are based on the following talk.You now have l5 seconds to read Questions l4~16.
How has Brazil reduced its population growth
A. By educating its citizens. B. By developing TV programs. C. By careful family planning. D. By chance. 参考答案:D