This change in polarity causes the magnetic field in front of the train to pull the vehicle forward, while the magnetic field behind the train adds more forward thrust.
这种极性的变化导致列车前方牵引列车前进的电磁场，同时列车后面的电磁场加上了更多的向前推力。
The polarity of impulse voltage and the polarity of insulator surface electric charge can affect the corona initial time of insulator, the change time - interval and the corona current.
外拖冲击电压的极性与绝缘子表面电荷极性是否相同会影响绝缘子的电晕起始时刻、由流注向先导的转变时间间隔和流注电晕电流。
The electric current supplied to the coils in the guideway walls is constantly alternating to change the polarity of the magnetized coils.
供给导轨槽内线圈的电流交互变化着电磁线圈的极性。
In addition, the morphology change of as-synthesized product could be realized from nanotubes to microspheres by changing the polarity of reaction solvent or ultrasonic power.
另外，通过改变溶剂极性或超声条件，可实现产物形貌从纳米管到微球的渐变过程。
Because the positive side of C1 cannot instantly change its polarity, it pulls low and slowly charges up again through the internal pullup resistor of the input.
而C1的正向不能立即改变极性，其被拉低并通过输入的内部上拉电阻，缓慢的再次充电。
They clfunction a relationship within the rotation and the magnetic polarity of Earth, which does change irregularly, with a magnetic reversal taking place every 400,000 years on audio-videoerage.
他们声称地球磁极和自转有相关。地球的磁极的确会不规律的改变， 大约均匀400，000年发生一次磁极转换。
They claim a relationship between the rotation and the magnetic polarity of Earth, which does change irregularly, with a magnetic reversal taking place every 400,000 years on average.
他们声称地球的自转和地球的磁极的关系不稳定，预示着平均每40万年就有一次的磁极颠倒。
They claim a relationship between the rotation and the magnetic polarity of Earth, which does change irregularly, with a magnetic reversal taking place every 400,000 years on average.
他们声称地球的自转和地球的磁极的关系不稳定，预示着平均每40万年就有一次的磁极颠倒。
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