Due to the large torque coefficient, small torque ripple and ease of control, permanent magnet synchronous motor (PMSM) system has been widely used in many accurate servo control systems.
永磁同步电动机系统具有力矩系数大、力矩波动小以及控制灵活等优点，在许多精密伺服控制系统中得到广泛应用。
Permanent wilting coefficient of two jujube varieties both lower than 3%, jujube has higher drought capacity.
其永久萎蔫系数均低于3%。表明这二种枣树的抗旱能力较强。
The permanent wilting coefficient of young jujube trees was 3.5 percent, but that of elder trees was about 3 percent.
枣树幼树叶片的永久萎蔫系数为3.5 %，而枣树大树叶片的永久萎蔫系数应在3%左右。
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