The device classes present in the system (classes include disks, partitions, and so on).

设备在系统中的类别描述(类别包括磁盘，分区等等)。

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It creates a huge application development framework, with which you can design really powerful graphical UI that will be portable across different device classes.

QT创建了一个庞大的程序开发框架，可用来设计强大的图形化界面，移植到各种设备中。

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In Part 1, I have demonstrated how to enumerate device classes.

在第1部分，我演示了如何枚举设备类。

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As one of the largest providers of wireless chipset and software technology in the industry, Qualcomm has a diverse chipset and software product portfolio spanning multiple device classes.

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It's about a firefighter who can download the design of a burning building onto a handheld device, a student who can take classes with a digital textbook, or a patient who can have face-to-face video chats with her doctor.

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In undergraduate economics classes this is called a commitment device.

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