题目内容
变压器是一种（）的电气设备，它利用电磁感应原理将一种电压等级的交流电转变成同频率的另一种电压等级的交流电。
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变压器铁芯的结构一般分为（）和壳式两类。
According to the historical records, ceramics were produced in Jingdezhen as far back as the ____ dynasty.
The porcelain in Jingdezhen is renowned “as white as____, as bright as____, as____as paper and as ____ as chime”.
Blue and white porcelain was born in ____ Dynasty.
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