0Mengikuti
0Pengikut
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Penicillin okokok
0 View
Light 2—The Photovoltaic Effect
Watt steam engine
Tesla 1
electric motor
The Secret of the Song Dynasty Refrigerator
The story of the refrigerator's birth
Newton's telescope
The story of the birth of the elevator
2 Views
air conditioner
1 View
How air conditioning was born
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