为什么影片上的一幅幅静止画面通过放映机的连续放映,在银幕上能形成活动的影像呢?实践证明,这主要是由于人们的()、()和()实现的。
参考答案:心理作用;视觉暂留;电影的机械作用
用所给单词的适当形式填空。
1. Gina ______ (look) very nice in the red dress.
2. It's very nice of you ______ (help) me fill in the card.
3. I don't know the girl. Do you know ______ (she)?
4. Adam, Alan and Arthur are all ______ (boy) names.
5. In the small village (村子), there are only eight ______ (family) now.
压缩机发生闷声是什么原因?