A. have jumped on some kinds of cars or trucks B. have begun their v-mail business operations C. have started to demonstrate to the public D. have begun their musical performance 参考答案:B
第36题: [多项选择]有关摄影距离的叙述,正确的是 A. 焦-片距又称FFD B. 焦-片距增大,模糊度增大 C. 焦-物距增大,模糊度增大 D. 物-片距减小,模糊度增大 E. 焦-物距减小,模糊度增大 参考答案:A,E 答案解析:FFD(focus film distance)即焦点一胶片距离,焦一物距减小时模糊度增大。