The electromagnetic force decays rapidly in the molten steel, and its decaying speed is related to the current frequency and polar pitch of the stirrer.
在电磁搅拌作用下，电磁力的大小随钢液液池宽度的增加呈指数衰减趋势，其衰减速率与电流频率和搅拌器极距有关。
Normally planes don't go to the polar post from February to October because of the dangers of flying in the pitch-dark and cold.
通常情况下，飞机不会在2月到次年10月之间经行极地，因为在漆黑、寒冷的天气下飞行是很危险的。
The polar equation of non-circular gear pitch curve, calculation method of center distance, formula of pitch curve length, primary circle radius and pressure Angle is given.
给出了非圆齿轮的节曲线极坐标方程，两齿轮中心距的计算方法，节曲线长度、基础圆半径和压力角的计算公式。
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