问题
名词解释
照相机的基本结构
答案
参考答案：
有主体、镜头、快门、取景器、输片机构、计数器，而性能比较完善的照相机还有调焦装置、测距器、连闪装置、自拍机等，性能更完善的照相机还有测光装置和小型闪光灯装置等。禄莱（Roueiflex）、哈苏（Hasseblad）、玛米亚（Mamiya）等是120照相机的常见品牌。
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照相机的基本结构
参考答案：
有主体、镜头、快门、取景器、输片机构、计数器，而性能比较完善的照相机还有调焦装置、测距器、连闪装置、自拍机等，性能更完善的照相机还有测光装置和小型闪光灯装置等。禄莱（Roueiflex）、哈苏（Hasseblad）、玛米亚（Mamiya）等是120照相机的常见品牌。
Do you know how to study better and make you study more effective (有效的)？We all know that Chinese students usually study very hard for a long .This is very good, but it doesn’t a lot , for an effective student must have enough sleep, enough food and enough rest and exercise. Every day you need to go out for a walk or visit some friends or some nice places. It’s good for your study. When you return your studies, your mind will be refreshed (清醒) and you will learn more study better. Psychologists (心理学家) that learning takes place this way. Here take English for example. First you a lot of progress (进步)and you feel happy. Then your languages study seems the same. So you will think you are learning and you may give up. This can last for days or even weeks, yet you needn’t give up. At some point your language study will again take another big . You will see that you really have been learning all alone. If you get enough sleep, food, rest and exercise, studying English can be very effective and . Don’t give up along the way. Learn slowly and you will get a good result.
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