If the boat wants to exercise on the water, it needs to provide external force to push it, so that it can overcome the resistance

The CLT propeller has a wide blade tip and an end plate. Based on the wake contraction principle of the propeller, the diameter of the

The air motor uses the engine room to compress the starting air. In the winter in the north or the cold season in the south,

(1) The hydraulic motor needs to be positive and negative, and must have symmetry in the internal structure, and the hydraulic pump often rotates in