单项选择题 5、12'b011100101010，这个二进制数表示的十进制数和十六进制数分别为？

单项选择题 About “new” and “delete”, which one is incorrect? A、“new” can be used to dynamically create objects and object arrays. B、When an object is created by “new”, the constructor of the class is called. C、If an object is created by “new”, “delete” should be used to destruct it. D、“new” and “delete” are often used in pairs, and they must be used in the same function.

单项选择题 PowerPoint文件默认的扩展名为（） A、.txt B、.pptx C、.xlsx D、,docx