adjustable pitch propeller
可调螺距螺旋桨
可调距螺桨
可调整螺距螺旋桨
调距螺旋桨
可变螺距螺旋桨
调距推进器
变距推进器
变距螺桨
可掂螺旋桨
Variable pitch propeller
变螺距螺旋桨
可变螺距螺旋桨
可调距螺桨
变距螺旋桨
变距螺桨
可掂螺旋桨
调距桨
two adjacent edges simply supported and the other two adjacent edges clamped
Two Returns and Two Having
two - component two - phase flow
Four plus Two work method
Two Foundation of mathematics
“Lantern”chicken in two styles
“one water two alcohols”method
1-D two phases reacting flow