| 摘要 |
<p>A nozzle comprises a passage with at least one vane (1, 3; 21, 23) extending therein. At least one portion (1; 21) of said vane is movable into and out of said passage. By moving the movable portion (1; 21) relative to the stationary portion (3; 23), the cross-sectional area of the passage is adjustable.</p> |
