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【简答题】
Voltage source inverters (VSIs) are named so because the independently controlled output is a voltage waveform. Similarly ,current source inverters (CSIs) are distinct in that the controlled AC output is a current waveform.
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【判断题】It wasn't until the 1980's that people began buying computer for personal use.()
A.
正确
B.
错误
【单选题】I began the day _____ tennis with a secondary-school friend I hadn't seen for a while.
A.
playing
B.
play
C.
to play
D.
played
【单选题】Ⅱ.学完Lecture 1的教学视频后，根据内容补全空缺处单词。（2分，共8分） ____11____ hasn’t seen Phoebe and Monica for ages. They arrange to meet in the bar. Amanda is so talkative that Phoebe and Monica even have no chance to spea...
A.
Amanda
B.
Amy
C.
Mandy
D.
Phoebe
【简答题】关于期货合约的标准化，说法不正确的是（ ）。
【单选题】AAIC 意为_____。 (130930:第7章 地面通信系统与业务) (A-0,B-0,C-0,D-0,错误-0)
A.
计费机构识别码
B.
通话信号
C.
通话结束
D.
通话开始
【简答题】“中庸”意为_________、________。
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