第3题: [单项选择]Sam refused to take the job because_______. A. the working hours were unsuitable. B. the job was not well paid. C. he had to do a lot of travelling. D. the job was quite difficult. 参考答案:B 答案解析:W: Do you know that Sam turned down that job offered by a travel agency
M: Yeah, the hours were co
第9题: [单项选择]The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement. A. the scavenging air B. the exhaust gases C. the mixed air D. the spray oil 参考答案:A
第37题: [单项选择]粒径小于7μm的被动靶向微粒，静注后的靶部位是（） A. 骨髓 B. 肝、脾 C. 肺 D. 脑 E. 肾 参考答案:B 答案解析:被动靶向制剂经静脉注射后在体内的分布首先取决于其粒径的大小，通常粒径在2.5～10μm时，大部分积集于巨噬细胞；小于7μm时一般被肝、脾中的巨噬细胞摄取；200～400nm的纳米粒集中于肝后迅速被肝清除；小于10nm的纳米粒则缓慢积集于骨髓；大于7μm的微粒通常被肺的最小毛细血管床以机械滤过方式截留，被单核白细胞摄取进入肺组织或肺气泡。
