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【单选题】
输出缺相的原因可能是:A.
输入电压值相差超过允许值
B.
输出电流三相不平
C.
超过变频器允许的最大电流（2倍额定值）
D.
直流母线电压超过允许值
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举一反三
【单选题】I ____ the accident from the TV, so I ’ m worried about Tom very much. I hope that I can ____ him soon.
A.
heard of; hear about
B.
heard from; hear about
C.
heard of; hear of
D.
heard about; hear from
【单选题】听力原文：M: Hello. International Friends Club. Can I help you? W: Oh, hello. I read about your club in the paper today and thought I'd phone to find out a bit more. M. Yes, certainly, well, we' re a sort ...
A.
She wants to know more about the club.
B.
She hopes to find a job in Washington.
C.
She plans to go to evening classes.
【简答题】认知主义者认为，世界是由客观实体、客观实体的特征及客观事物之间的关系构成的。（ ）
【简答题】媒体策划方案的构成要素有哪些？
【简答题】策划的构成要素有哪些?
【单选题】听力原文：W：That's a shame about your mobile phone. Talk about bad timing! M：Tell me about it. Just last Sunday，I put 50 dollars into it and I hoped it would make it through another year． Q：What can be inf...
A.
It requires constant care.
B.
It's very old-style.
C.
It cost the woman 50 dollars to buy.
D.
It can't tell the correct time.
【简答题】轴一般由( )、( )和( )组成。
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