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欲改造自然，必先征服自然是哪个传统的观点？
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最早提出“知识就是力量”的人是（ ）。
The key technology of satellite optical communication, APT, refers to three important functional modules including ______________, ______________, ____________________.
The preferredoptical wavelength range for underwater optical communication is _________, so it is always called _______ .
The two common types of white-light LED used in the visible light communication system are ________ and____________.
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