| 摘要 |
<p>The protection covering comprises a central panel (1) or bottom and two side panels (2,3) having two free end edges and is preformed in aluminum sheet. It has intermediate strips (16,17) which join the panels in pairs. The panels have two longitudinal undulations constituting an extensible bellows. The vertical end free edges each have a stiffening reinforcement (30,31).</p> |
