在“探究平面镜成像特点”的活动中：（1）实验室提供了如下器_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题

在“探究平面镜成像特点”的活动中：

（1）实验室提供了如下器材：①厚为2mm的茶色玻璃；②厚为5mm的透明玻璃；③直尺；④光屏；⑤两只相同的蜡烛；⑥火柴．探究活动中应选用的玻璃板是______ （填序号）．

（2）如图所示，点燃A蜡烛，在玻璃板的另一侧慢慢移动B蜡烛，直到与A蜡烛的像______为止，证明像与物的大小相同．

（3）移去蜡烛B，并在原位置上放一光屏，在光屏上你______（选填“能”或“不能”）看到像．

答案

（1）采用很薄的玻璃板，使两个反射面成的像几乎重合，使实验简单化，故探究活动中应选用的玻璃板是厚为2mm的茶色玻璃．

（2）蜡烛B和A的像重合，说明蜡烛B和A的像等大，AB是相同的蜡烛，所以A蜡烛和A的像相同．所以当B蜡烛与A蜡烛的像完全重合时，证明像与物的大小相同．由于成的是虚像，人眼应在A蜡烛一侧观察，即眼睛应位于透明玻璃的前面．

（3）移去后面的蜡烛B，并在原位置上放一光屏，发现在光屏上不能承接到像，因为虚像不能用光屏承接，说明是虚像．

故答案为：（1）①；

（2）完全重合；

（3）不能．

完形填空

Mr. Glen is a millionaire. Five years ago, after returning from abroad to his motherland, he ___36___his small company. Speaking of success, Glen often tells us a story about his extra expensive “school” fee. He always ___37___his success to it.
At that time, Glen, who already got a Ph.D. degree, ___38___to return to the homeland, starting a company. Before leaving, he bought a Rolex watch with the ___39___made through years of work after school and the scholarships. At the airport he had to accept the ___40___customs check. The watch on his wrist was also demanded to be taken down for ___41___. Glen knew that carrying the specific goods out had to pay the tax, and he worried about paying ___42___for his watch. So when he was checked, he told a lie that his watch was a ___43___fake（假货）. When he was ___44___of his “smarts”, immediately, in the presence of Glen, the officers hit the watch, ___45___cost nearly 100,000 into pieces ___46___hearing Glen’s words. Glen was ___47___. Before he understood why, he was taken to the office to be examined ___48___. For many times of entry-exit ___49___he knew that only those people in the “blacklist” would “enjoy” this special treatment. The officers looked over everything carefully in the box, and ___50___him no matter what time of entry and exit he must accept the check and if __51___reusing and carrying fake and shoddy goods, he would be ___52 __according to law! Suddenly, his face turned red, and he had nothing in mind after boarding the plane for long.
After returning to the homeland, he often told the story to his family, and his employees, too. He said that this made a deep ___53___on him, because the additional high “school” fee that he had ever paid made him realize the value of ___54__, which he would remember as the ___55___of his success forever.

A．Disappointed

B．experiences

C．experiments

单项选择题

变电站名牌一般安装在变电站大门左侧门柱上，站名牌底端离地面（）为宜。

A.1400mm

B.1500mm

C.1600mm

D.1800mm