皮皮学，免费搜题
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搜题
【单选题】
异步电动机旋转磁场的转向与 有关。A.
电源频率
B.
转子转速
C.
电源相序
D.
负载类型
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: Here we are. This is the National Palace Museum. What are you especially interested in seeing? W: It's hard to say. In fact, I know very little about Chinese art and history. But can you give ...
A.
In a concert hall.
B.
In the National Palace Museum.
C.
At an exhibition.
D.
On the plane.
【简答题】按照原料的商品种类分,海蜇属于( )。