• The invention solves the problems that an electric switch contact is burnt by sparks and is damaged.

    发明解决电器开关触点火花灼烧、损坏问题

    youdao

  • The invention solves the problems that an electric switch contact is burnt by sparks and is damaged.

    发明解决电器开关触点火花灼烧、损坏问题

    youdao

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