| 摘要 |
The system has a single-piece body (10) and a set of crossing openings (11, 12) that is provided on the single-piece body according to an axis (101) to allow passage of a pin in sliding motion. An auxiliary part is arranged with another set of crossing openings (21, 22). The latter set of crossing openings is arranged according to another axis (201), where cross-section of the latter openings is virtually identical to that of the former openings. A coupling unit is utilized for coupling/disconnecting the auxiliary part and the body so that the latter openings are coaxial. |
