Hand power generation: Size 8 * 10 * 11 Rotating the mechanical arm, through the belt pulley, big wheel with small wheel, small wheel with big wheel, do more power to generate current. Working...
Transmitter course courseware The principle of radio receiving and transmitting is that the transmitter sends out current of different frequency and wavelength according to the requirements of...
Madebo hemisphere experiment courseware
[design concept]
In many aspects of human life and production, we need to use the knowledge of atmosphere and atmospheric pressure. Understanding and feeling...