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【简答题】
匀强磁场中有一无限大均匀载流平面，位于x=0处，其电流面密度沿X方向，量值j 0 =100A/m，如图所示。现测得载流平面上方(z＞0)的磁感应强度B 1 =6.28×10 -5 T，且沿Z轴正方向。试求载流平面下方(z＜0)的磁感应强度B 2 。
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【简答题】胎盘placenta
查看完整题目与答案
【单选题】友元访问类对象的成员时使用（ ）。
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类的成员名
B.
“this->成员名”的形式
C.
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查看完整题目与答案
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