题目

Susan had long blonde hair and big blue eyes.So did most of the other  1  in her school class,which troubled her a lot.”I look like everyone else! I’m not special! I’m boring!”Susan  2 to her mother.     She decided to try to make herself look  3  .She painted big pink spots on her neck and when she didn’t get attention,she stuck a long plastic nose on top of her real nose.Nobody noticed that,  4  .She took ink(墨水)and poured it all over her  5  .She wore clown(小丑)clothes to school and stuck leaves in her ears. 6  no matter what she did.she在LC电磁振荡电路中有振荡电流存在,理想的情况是能量没有损失,振荡电流的振幅保持不变.但实际的振荡电路如果没有外界能量的及时补充,振荡电流的振幅总是要逐渐减小的.下面的几种情况中,哪些是造成振幅减小的原因(    ) A.线圈自感电动势对电流的阻碍作用           B.电路中电阻对电流的阻碍作用C.线圈中铁芯内感应电流产生热量              D.向空间辐射电磁波
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