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【单选题】
线圈中通入变化的电流时，线圈会产生自感，可用公式描述自感电动势和电流之间的量和方向关系。该式中的的参考方向是这样规定的：（）。
A.
的参考方向与i的参考方向一致
B.
的参考方向与i的参考方向之间符合右手螺旋关系
C.
的参考方向与i的参考方向之间符合左手螺旋关系
D.
的参考方向可任意选择
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【简答题】Bosses now prefer to be paid in share options. The average chief executive of one of America’s top 200 firms would take home just over $750,000 in gold. In fact, in 1998 he made a pre-tax profit of $8...
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