They are caused by the counter-rotating waves set up in the earth's electric field.
他们是导致在地球电场上形成逆向旋转波动的原因。
The basic design thinking of counter-rotating axial fan is put forward in this paper.
提出了设计对旋式轴流通风机的基本设计思路。
The basic design thinking of counter-rotating axial fan is put forward in this paper.
提出了设计对旋式轴流通风机的基本设计思路。
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