皮皮学，免费搜题
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【单选题】
开关电源中必须用缓启动电路，下面哪个电路是正确的？（）A.
A
B.
B
C.
C
D.
D
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】——、——、——一起被称为旅游业的三大支柱,是旅游供给的基本构成要素
【单选题】What does the woman say about the local people?
A.
They enjoy being so far away from technology.
B.
They live miles and miles away from each other.
C.
They never travel more than 15 miles alonge the river.
D.
They are separated from the world outside of the jungle.
【单选题】What does the woman say about the local people?
A.
They enjoy being so far away from technology.
B.
They live miles and miles away from each other.
C.
They never travel more than 15 miles along the river.
D.
They are separated from the world outside of the jungle.
【简答题】绿色开花植物体是由六大器官构成的：根、______、______、花、______、______，其中前面三种被称为______器官，后三种被称为______器官．
【简答题】在旅游业构成中，被称为旅游业三大支柱的是：旅行社、（）、（）
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