28. 7. 201210 tis. zhlédnutíThese footages show the training of a Beijing Military Region's armoured battalion equipped with the ZTZ99A/Type 99 main battle tank. It shows among others s...
Před 8 měsíci2 163 zhlédnutíSound plays an important role in our daily lives, and speakers are one of the key components that convert electrical signals into sound. In loudspeaker desig...