- 
				           		在螺旋桨式风机的静压曲线中存在着不稳定区域或断点。
						        					            	 There is always an unstable region or break in the static pressure curve of a propeller fan.
								    										 
								    				            	 youdao 
- 
				           		在螺旋桨式风机的静压曲线中存在着不稳定区域或断点。
						        					            	 There is always an unstable region or break in the static pressure curve of a propeller fan.
								    										 
								    				            	 youdao