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【简答题】
什么是电压型逆变电路?什么是电流型逆变电路?二者各有什么特点。
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】A subway is not just an important form of transport. It is also a window for other people to learn about local cultures. Beijing, China The Beijing Subway was opened in 1969 and is the oldest subway s...
【多选题】旅行社服务网点应当在经营场所的显要位置悬挂（）
A.
旅行设业务经营许可证
B.
旅行社分社备案登记证明
C.
旅行社服务网点具备登记证明
D.
旅行行社服务网点营业执照
E.
旅行社分社经营执照
【单选题】_____ for the young man to spit in the subway!
A.
How bad manners it is
B.
How bad manners they are
C.
What bad manners they are
D.
What bad manners it is
E.
What an interesting
【单选题】Why is not necessary for the man to take a taxi to the hotel?
A.
Because there is an excellent bus service.
B.
Because there is an excellent railway service.
C.
Because there is an excellent subway service.
【简答题】电路是由 、 、 和导线构成。
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