题型:选择题 The reason _____ he pretended (故意) to sleep in class was quite different from the one _____ you explained to me. [ ]A. why; that B. that; why C. that; which D. why; why 查看答案
题型:选择题 如图所示,把一正方形线圈从磁场外自右向左匀速经过磁场再拉出磁场,则从ad边进入磁场起至bc边拉出磁场止,线圈感应电流的情况是( )A.先沿abcda的方向,然后无电流,以后又沿abcda方向B.先沿abcda的方向,然后无电流,以后又沿adcba方向C.先无电流,当线圈全部进入磁场后才有电流D.先沿adcba的方向,然后无电流,以后又沿abcda方向 查看答案