— My computer has gone wrong. It needs _______ soon.— Why not have David _______ it? Nobody can if he can't.
选出不同类的单词( )
1.35的小数点向____移动____位,它就扩大100倍变成____。
物体到凸透镜的距离大于2倍焦距时,成倒立____的____像,根据这个道理制成____,它的镜头相当于____,它用____来承接像.