Are the motors “single phase electric” or “ Three-phase electric”

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• Are the motors “single phase electric” or “ Three-phase electric”
• electric motors是什么意思
• Swiss scientists have created the world's smallest electric car,which is made of a single moleculeand has four wheels.的翻译.
• the basics of electric propulsion were virtually unknown 17 years ago,while today there are electric motors everywhere.3
• Are the motors “single phase electric” or “ Three-phase electric”请问是单相电还是三相电的意思,我主管说是单接头和三接头的意思,不知道是否准确,
• Swiss scientists have created the world's smallest electric car,which is made of a single molecule
• 3xy+(3x+x)*(1-2/5)=2[xy+(3x+x)*(2/5)+y]
• 在△ABC中 AB=5 BC=7 A=120° 求△ABC面积