It required three spools, each containing approximately 900 feet of number 27 Heavy Formvar wire for the primary sections.
这个工作需要三个线轴，每个上面有900英尺27号线来绕制初级绕组。
It required three spools, each containing approximately 900 feet of number 27 Heavy Formvar wire for the primary sections.
这个工作需要三个线轴，每个上面有900英尺27号线来绕制初级绕组。
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