K - 1 alien may legally obtain employment with employment authorization document after entering the u . s . however , considering that the k - 1 alien must marry the sponsoring fiance within 90 days after entering the u . s . and right after the marriage he or she can apply for the ead through the adjustment of status application , it is more practical for the alien to apply for the ead with the adjustment of status application , rather than filing it separately prior to filing for adjustment of status 持k - 1签证的外国人来美国后可以申请工作许可但是考虑到外国未婚配偶在入境90天内必须和美国公民结婚结婚后又要申请转换成绿卡身份同时也可申请工作许可在现实中外国配偶在申请转换绿卡身份之前单独申请工作许可能会造成短期内重复申请的浪费因此除非一入境美国就要工作否则可以等申请绿卡时一同申请。
Moreover , stator flux can keep round , this is very useful in braking control . moreover , the thesis puts forward the strategy that fuzzy controller replaces smith flip - flop . based on the tolerance of smith flip - flop is a fuzzy variable , fuzzy controller can replace smith flip - flop the performance of this system can be improved if the tolerance of flux and torque is graded and voltage vector can be elected by this 电压矢量的选择依赖于电磁转矩偏差、定子磁链偏差和磁链位置，用模糊控制器取代施密特触发器是基于容差大小本身就是一个模糊的语言变量，如果把磁链和转矩的容差分级，并以此作为选择电压矢量的依据，那么系统性能会得到改善。
