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【简答题】
It is the first time that I _______ this kind of moon cake. A．enjoyed B．have enjoyed C．enjoy D．enjoying
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举一反三
【单选题】I ( ) my hometown for a long time. I really miss it.
A.
went away from
B.
have been away from
C.
have left
D.
have been left
【单选题】I my hometown for a long time. I really miss it.
A.
left
B.
went away from
C.
have been away from
【简答题】一个无限长的直导线与直角三角形导线框在同一个平面内，导线框的一个直角边与直导线平行，如下图所示。求直导线与导线框间的互感。
【简答题】如图所示，一无限长的直导线中通有交变电流i=I 0 sinωt，它旁边有一个与其共面的长方形线圈ABCD，长为l，宽为(b-a)。
【简答题】如图所示，一无限长的直导线中通有交变电流i=I0sinωt，它旁边有一个与其共面的长方形线圈ABCD，长为l，宽为(b-a)。试求： (1)穿过回路ABCD的磁通量Φ； (2)回路ABCD中的感应电动势ξ。
【简答题】如图11-28所示，一无限长的直导线在某处弯成半径为 R的1/4圆弧，圆心在O处，直线的延长线都通过圆心。已知导线中的电流为I，求O点的磁感应强度。
【单选题】I ____ back my hometown for a couple of years. I miss it a lot.
A.
have gone
B.
haven’t gone
C.
have been
D.
hasn’t been
【单选题】I _______ my hometown for a long time. I really miss it.
A.
left
B.
went away from
C.
have left
D.
have been away from
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