| 摘要 |
<p>The connector is attached to a tube and connected to a node when building three-dimensional models for use in geometry or chemistry. It comprises two pairs of half circles, the front pair (1) being at right angles to the back pair (2). The half circles are connected by longitudinal ribs (3, 4) and semi-conical lugs (6) are attached to the front pair. These fit either outside or inside a tube.</p> |
