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【多选题】
无限大系统发生三相短路时，短路电流包含（ ）A.
幅值不变随时间作周期性变化的分量，其幅值大小取决于电源电压幅值的和短路回路的总阻抗
B.
幅值随时间而衰减的非周期分量，这是由于电感中的电流在短路瞬间前后不能发生突变
C.
幅值衰减随时间作周期性变化的分量，其幅值大小取决于电源电压幅值的和短路回路的总阻抗
D.
幅值不变的非周期分量，这是由于电感中的电流在短路瞬间前后不能发生突变
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【单选题】Don't _____ a dictionary every time you come across a new word while reading, otherwise you will soon get bored and stop reading. [ ]
A.
look up
B.
consult
C.
refer
D.
discuss
【简答题】Practice reading the new words with the tape, then make a record of your new-word-reading.
【简答题】Read the new word list and the passage of text 1.the new word list on page 194, and passage on page 194-195 upload your reading in this application.
【单选题】When you meet a new word in reading the English papers, you can guess its meaning but needn’t always ______ the dictionary.
A.
look up
B.
attach to
C.
pay attention to
D.
refer to
【单选题】When yo u meet a new word in reading the English papers, you can guess its meaning but needn't always ________ the dictionary. [ ]
A.
look at
B.
attach to
C.
pay attention to
D.
refer to
【简答题】When you are reading something in English, you may often meet with a new word. What’s the best way to know it? You may look it up in the English-Chinese dictionary. It will tell you a lot about the wo...
【多选题】When reading , which are helpful to understand the new word in the text ?
A.
example
B.
synonym
C.
antonym
D.
main idea of the sentence or the text
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