目的为了深入研究连续流双污泥反硝化同时除磷系统的主要影响因素，确定系统最佳运行条件。

The affecting factors of the continuous-flow two-sludge system for simultaneous biological phosphorus and nitrogen removal were investigated in order to decide on the best working state of the system.

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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。

Because of the influence of the hull, the stern propeller of a twin-screw vessel is working under condition of oblique flow, and the unsteady working condition of the blade of a propeller is created.

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