Because of the influence of the hull, the stern propeller of a twin-screwvessel is working under condition of oblique flow, and the unsteady working condition of the blade of a propeller is created.
由于船体的影响，双桨船的螺旋桨处于斜向来流的条件下运转。斜流造成螺旋桨叶工作状态的非定常性。
2
The screw should be entered from the middle of the distal portion of the scaphoid node and paralleled the main blood vessel of scaphoid under arthroscopy.
关节镜监视下的手舟骨骨折内固定的进钉应从手舟骨结节的远端中点进入，方向平行于手舟骨的主要血管束。
3
To inspect the defects on the screw hole surfaces of nuclear reactor pressure vessel in nuclear power station, an automatic moving table was designed to carry sophisticated inspecting devices.