An arrangement of letters used to identify a specific security. When a company issues securities to market, it selects an available ticker symbol, which investors use to place orders. Every listed ...

看过一个关于screen的例子后，你应该会问起：你是如何来组织这些screen的？在它们之间是如何导航的？你是如何管理显示及输入设备的？回答是 ...