S

Strieb5eck

    Installation principle of expansion screw
    0:22
    Engine internal structure
    0:14
    Working principle of silencer
    0:19
    Height determines energy
    0:24
    Principle of seabed drilling
    0:26
    Who can tell me about this?
    0:34
    The change in air when a bullet is fired
    0:08
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