| 摘要 |
<p>The instrument consists of two square-section tubes (1) with outer reinforcing members (2) that can be fixed together at a set angle or connected by a hinge that allows the angle between them to be varied between 0 and 360 degrees. The tubes and outer reinforcing members are connected by adjustable threaded rods (4) engaging with nuts (3) and threaded plates (5), and the reinforcing members have movable or detachable handles (9) on their ends.</p> |
