Proposal work should begin at the beginning of the fourth semester, and end no later than mid-term of the fifth semester.

开题工作应在第四学期初开始，最迟应在第五学期中结束。

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In the fifth semester, we learned fundamental knowledge of semiconductors, AC circuit amplifier, and the switching among logic circuit, analog circuit and digital circuit.

在第五学期我们学了半导体基础知识、交流放大电路、逻辑电路、模拟电路和数字电路的转换。

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