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【简答题】
10 题8. 10 图中所示是一根很长的长直圆管形导体的横截面,内、外半径分别为 , ,导体内载有沿轴线方向的电流 ,且 均匀地分布在管的横截面上.设导体的磁导率 ,试证明导体内部各点 的磁感应强度的大小由下式给出:
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举一反三
【简答题】The present system is ______ than the old one． 现在的系统比以前那个高效得多。
【单选题】Attempts to ______this old system have been made in every presidentialelection in the past one hundred years, but the system has survived all assaults.
A.
break down
B.
break in
C.
break up
D.
break through
【单选题】在货币计量前提下,我国企业的会计核算可以选用一种外币作为记账本位币,但其编制的财务会
A.
告应折算为( )反映。
B.
人民币
C.
某种外币
D.
记账本位币
E.
功能货币
【简答题】地基是承受基础传来荷载的土层。 判断对错
【简答题】______ wrote about the disintegration of the old social system in the American Southern States and its effect on the lives of modern people, both black and white.
【单选题】Which of the following substance can NOT be found directly from an old ventilation system?
A.
Chemical disinfectants.
B.
Bacteria.
C.
Fungi.
D.
Pentachlorophenol.
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