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【单选题】
用线圈的自感系数 L 来表示载流线圈磁场能量的公式A.
只适用于无限长密绕螺线管
B.
只适用于单匝圆线圈
C.
只适用于一个匝数很多，且密绕的螺线环
D.
适用于自感系数 L 一定的任意线圈
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举一反三
【单选题】Although I've never worked for a bank before, I feel quite ______ there because I'm used to dealing with figures. [ ]
A.
at peace
B.
at home
C.
at sea
D.
at will
【单选题】I’ve worked______four hours on this article, I'm completely______.
A.
in, concentrated
B.
at, distorted
C.
out, captured
D.
for, distracted
【单选题】I've _________ in the school for a year now, and I really love my students. [ ]
A.
worked
B.
arrived
C.
joined
D.
come
【单选题】I've worked with him now over the course of four years, I know him ______.
A.
here and there
B.
back and forth
C.
backwards and forwards
D.
now and then
【单选题】Although I’ve never worked for a bank before, I feel quite ______ there because I’m used to deal
A.
33. Although I’ve never worked for a bank before, I feel quite ______ there because I’m used to dealing with figures. A．at peace
B.
at home
C.
at sea
D.
at will
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