题目内容

无源逆变是指把直流电能转变成交流电能送给电网

A. 对
B. 错

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变流器在逆变状态时，控制角α必须在（）

A. 0°~90°
B. 30°~120°
C. 60°150°
D. 90°~150°

可实现有源逆变的电路为（）

A. 三相半波可控整流电路
B. 三相桥式半控整流电路
C. 单相全控桥接续流二极管电路
D. 单相桥式半控整流电路

下面哪些功能不属于变流技术的功能（）

A. 有源逆变
B. 交流调压
C. 变压器降压
D. 直流斩波

spectacular immediately liberally cozy spicy overlooking laden panic resist blend1He sat down and helped himself_________ to cold beer and pickles.2 _food doesn’t suit my stomach, and it makes me feel ill.3 The table was____ with maps, charts, and books.4 The park is on a hill_ the town.5 All these activities gave him a full_ , but somehow he managed.6 What is clear is that its advantages were apparent to all.7 Oil does not with water.8 I felt watching the hearth fire in the cold night.9 I can never an ice cream.10But even in viewing the most _______sights, the eyes are lazy.