如下图所示，是我国运载火箭上“箭载摄像机”拍得火箭上升时的一幅图片。摄像机镜头相当于一个凸透镜，像成在感光元件上。若拍摄该图片时镜头的焦距为f，为保证成像清晰，镜头到感光元件的距离v满足的条件是____ ，物体经该镜头成的像是(填“倒立”或“正立”)____的。摄像机在高温环境下工作，镜头用抗高温的石英材料制成，这是因为石英的为____ 较高。

阅读理解。

    Amy and Sarah are good friends. They are from America. They like winter in America because there are many activities in winter. They can make a snowman,go fishing and go skiing with many friends. There are two festivals (节目) in winter. They're Christmas Day and Thanksgiving. Amy and Sarah are very happy. But they're in Beijing now. They like winter in Beijing, too. Because It's beautiful. It's windy and cold. They're going to visit the Great Wall, so they're very happy.

2014年，明星张国立之子张默、成龙之子房祖名都因容留他人吸食毒品罪被法院判处有期徒刑6个月并处相应的罚金。上述材料说明（  ）