| 摘要 |
The blade has front and back sides extending between a base and a top, and a lower part (42a) extending radially between the base and a lower limit (44) of a center part (42b). An upper part (42c) extends radially between an upper limit (46) of the part (42b) and the top. A rotating axis provides a tangential component (48), which is radial at a level of the parts (42a, 42c) and has two curves at the level of the part (42b). |
