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【简答题】
电压型逆变电路的第三个特点是:当交流侧为( )负载时,需要提供无功功率,直流侧电容起缓冲无功能量的作用,为了给交流侧向直流侧反馈的无功能量提供通道,逆变桥各臂都并联了( )。
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反馈参考答案：
举一反三
【简答题】*Fill in the blanks. 1. The main part of a word is called the ____________. 2. A word part at the beginning of a word is a(n) ____________. 3. A word part at the end of a word is the ____________. 4. ...
【单选题】There are many ways used in communication. The printed word is just about the most important way we have【C1】______communicating with one another. Look around you at the【C2】______in school at the news-...
A.
by
B.
with
C.
of
D.
in
【单选题】What is the most probable meaning of the word 'impasse' (Line 1,Para. 4)?
A.
A very complicated situation hard to deal with.
B.
A test that candidates for school boards should take.
C.
A democratic process that the pro-science try to engage.
D.
A possibility that no body can find an efficient solution.
【单选题】is the most important of all characteristics of the basic word stock.
A.
Productivity
B.
Stability
C.
Collocability
D.
All national character
【单选题】From item 1 to 10 Choose the word or phrase that is most closely related to the given word or phrase a surprise
A.
known
B.
unknown
【简答题】在TCP/IP环境下,网络层有一组将IP地址转换为相应物理网络地址的协议,这组协议即为_______。
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