问题 填空题

如图所示,密封的玻璃泡内装有少量的碘颗粒,对玻璃泡微微加热,会看到______色的碘蒸气弥漫在玻璃泡中.这一物态变化在生活中也有很多,试举一例:______.

答案

给玻璃泡中的碘加热,碘就会升华为紫色的碘蒸气;

类似现象:冬天,冰冻的衣服变干.

故答案为:紫;冬天,冰冻的衣服变干.

问答题

       “起来,饥寒交迫的奴隶,起来,全世界受苦的人!……”这是一首唱遍全球的无产阶级战歌,请你简单介绍一下它的创作背景及起到的历史作用。

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

单项选择题