问题
问答题
放映宽银幕彩色影片:
(1)银幕是用粗糙的白布做的,这是为什么?
(2)银幕与普通银幕不同,它要拉成圆弧形而不是平面,这是为什么?
答案
(1)粗糙的白布产生漫反射,且能反射有色光,这就保证不同位置上的观众都能看到彩色的像;
(2)银幕拉成圆弧形,是使银幕到幻灯机的镜头距离都相等,即像距相同,这就保证了成在银幕上的画面都清晰。(答案合理即可)
放映宽银幕彩色影片:
(1)银幕是用粗糙的白布做的,这是为什么?
(2)银幕与普通银幕不同,它要拉成圆弧形而不是平面,这是为什么?
(1)粗糙的白布产生漫反射,且能反射有色光,这就保证不同位置上的观众都能看到彩色的像;
(2)银幕拉成圆弧形,是使银幕到幻灯机的镜头距离都相等,即像距相同,这就保证了成在银幕上的画面都清晰。(答案合理即可)
从下面所给出的词汇中选出恰当的词汇,用正确的形式填空,其中有2个多余的词汇。
2. The report ______the importance of improving safety standards. 3. He _________his daughter to change her mind. 4. Parents worry about the _______________of music on their adolescent's behavior. 5. An earthquake left the whole town in ___________. 6. What _________him most was their speed. 7. Smoking __________in the building. 8. Success and wealth _________ his character. 9. An important _____________ of Van Gogh's paintings is their bright colors. 10. Lions and house cats evolved (进化)from a common ____________. |