• What if the trolley can be stopped by dropping a large weight in its path from a bridge overhead?

    如果这个电车可以通过头顶一个重物停下呢?

    youdao

  • Insulated overhead crane is a kind of bridge cranes.

    绝缘起重机桥式起重机

    youdao

  • Insulated overhead crane is a kind of bridge cranes.

    绝缘起重机桥式起重机

    youdao

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