The spirally threaded shaft of a worm gear.
螺纹杆与齿轮相啮合；改变轴旋转运动的方向。
Spirally corrugated and sawtooth-shaped fin tube is a high performance condensation heat transfer tube.
螺旋槽锯齿翅片管是一种新型高效冷凝换热管。
Spirally corrugated and sawtooth-shaped fin tube is a high performance condensation heat transfer tube.
螺旋槽锯齿翅片管是一种新型高效冷凝换热管。
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