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【单选题】
真空中两根很长的相距为2a的平行直导线与电源组成闭合回路如图．已知导线中的电流为I，则在两导线正中间某点P处的磁能密度为【图片】A.
(A)
B.
(B)
C.
(C)
D.
(D) 0
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反馈参考答案：
举一反三
【简答题】v.仓促完成(困难的事)
【简答题】The purpose of Subject Line is ( ) the topic of the letter.
【判断题】The subject line is usually the order or contract number to enable the receiver to be clear of the contents in the letter
A.
正确
B.
错误
【单选题】При необходимости вызвать экстренные службы _____ городского телефона следует позвонить по номеру 01.
A.
из
B.
от
C.
для
D.
с
【简答题】仓促完成(困难的事
【判断题】The subject line is usually the order or contract number to enable the receiver to be clear of the contents in the letter.
A.
正确
B.
错误
【单选题】What does the subject line tell the recipients?
A.
What the letter is about.
B.
When the letter has been sent.
C.
Who wrote the letter.
D.
Who typed the letter.
【简答题】Judging from the subject line, what is this email mainly about? The subject line shows that the writer wants to tell the recipient that she has come back to ___________ .
【简答题】v.仓促完成(困难的事) ;( 迅速而吃力地)爬,攀登
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