皮皮学，免费搜题
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【简答题】
Well, once we have that experience with GoPro and Google Glass, how do we make it more ? How do we take that next step? Well, we take that step by going to something called the Oculus Rift, which I'm sure many of you are also familiar with. The Oculus Rift has been described as one of the most realistic virtual reality devices ever created, and that is not empty hype. I'm going to show you why that is not empty hype with this video.
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【简答题】什么是“门到门”运输?
【单选题】定子三相绕组通入三相交流电即可产生旋转磁场。当三相电流不断地随时间变化时，所建立的合成磁场也不断地在空间旋转。旋转磁场的旋转方向与三相电流的相序一致，任意调换两根电源进线，则()。
A.
旋转磁场反转
B.
旋转磁场正转
C.
旋转磁场停转