There are three development for the Middle Power Amplifier : the first stage power amplifier, the drivestage power amplifier and the last stage power amplifier .
本文对固态线性功率放大器的研制包括：前级放大器的研制、驱动级放大器的研制、末级放大器的研制。
2
Additionally, use cases drive user-experience modeling, which sets the stage for ensuring the user interface is consistent throughout the solution.
此外，用例驱动用户体验建模，为确保用户界面在整个解决方案过程中的一致性设置了相应的阶段。
3
For a hard drive, the MBR loads a stage 1 boot loader, which is typically either the LILO or GRUB stage1 boot loader on a Linux system.