| 摘要 |
<p>A tank (1) comprises two half-shells (2, 3) moulded from plastics material and joined along respective edges or flanges (2a, 3a). These half-shells (2, 3) are shaped in such a way that their joining edges or flanges (2a, 3a) are in a concavity (4) in the tank (1).</p> |
