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【简答题】
某厂设有 SL7-3150 ( kVA )变压器一台,高 / 低压侧额定电压为 35/6.3kV , U K %=7 。该变压器通过 35kV 架空线路(长 5km , X 0 =0.4 Ω /km )与无限大容量电力系统相连,试问在变压器高、低压侧分别发生三相短路时的 I K 、 i sh 、 I sh 和 S K 各等于多少?
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举一反三
【单选题】Sam often ____ his room on Sundays. Look! He ______it now. [ ]
A.
cleans; cleans
B.
cleans; is cleaning
C.
is cleaning; cleans
D.
is cleaning; is cleaning
【简答题】Mr. Chen lost a lot of money in his business.__________. [A] So did he [B] So he did [C] So was he [D] So he was
【单选题】Tom _ _ his room every day. He it now.
A.
cleans, clean
B.
cleans, cleaning
C.
cleans, is cleaning
D.
clean, is cleaning
【简答题】学校打算成立一个奖学金，每年发放一次，奖励给学校学习最好的一名学生５００００元，奖学金的基金保存在银行，银行一年的定期存款利率为 ２％。问学校要投资多少钱作为奖励基金?
【单选题】在物价持续下跌的情况下,下列各种存货计价方法中,能使企业计算出来的当期利润最小的计价方法是( )
A.
先进先出法
B.
加权平均法
C.
移动平均法
D.
以上三种方法均有可能
【单选题】_______all his efforts he failed, he was so upset about himself that he felt like crying.
A.
So long as
B.
In terms of
C.
In spite of
D.
regardless of
【简答题】I hope the weather by this afternoon,because we want to go out.A．cleans upB．cleans outC．clears upD．I hope the weather____ by this afternoon,because we want to go out. A．cleans up B．cleans out C．clear...
【简答题】He returned to his hometwon so that he could indulge his passion for football. A) develop B) enjoy C) break D) limit
【单选题】－David has made up his mind to continue with his studies. －_______ and _______.
A.
So he has; so have I
B.
So has he; so have I
C.
So he has; so I have
D.
So has he; so I have
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