题目

把一根长直导线平行地放在如图所示磁针的正上方附近,当导线中有电流通过时,磁针会发生偏转。首先观察到这个实验现象的物理学家是(      )(A)奥斯特      (B)爱因斯坦    (C)牛顿    (D)伽利略  答案:A   解析:略  ------ did you remember the days _____ we worked on the farm ? ------ Certainly . Especially the hard times _______ we spent together .A.which ; whenB.when ; whenC.when ; whichD.which ; which
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