题型:问答题 简答题 物体从凸透镜的5倍焦距处移向透镜的过程中,下列有关成像的说法正确的是( )A.总能用光屏找到所成的像B.物体到达2倍焦距处时,成正立等大的像C.所成的像逐渐向透镜靠近D.只要物距大于焦距,像与物总是位于透镜的两侧 查看答案
题型:问答题 简答题 -Hello, Sandy. This is Jack. What are you doing? -I'm watching a match. It started at 7 p. m. and on for another half an hour. [ ]A.has been B.was C.had been D.will be 查看答案