| 如图所示，处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd，以恒定的角速度ω绕ab边转动，磁场方向垂直于纸面向里，线圈所围面积为S，线圈导线的总电阻为R．t=0时刻线圈平面与纸面重合，且cd边正在离开纸面向外运动．则正确的是（ ） A．时刻t线圈中电流的瞬时值i B．线圈中电流的有效值I C．线圈中电流的有效值I= D．线圈消耗的电功率P  |
答案：C
阅读下面短文，根据所读内容，在文章后的空格里填入一个最恰当的单词，并将答案填写在答题卡的相应位置上。 注意：每个空格只填一个单词  Sue and Jim were neighbours for five years but they were never interested in each other. Then one day, Sue saw Jim’s music collection. She noticed a rare punk rock CD that she also owned. At that moment, she realized that they both had the same interest in music and they started talking. Sue said, “I thought we had nothing in common（相同）until I saw his CD by the New York Dolls.” They are now married and living with each other. Some psychologists (心理学家) think that your taste in music is related to (有联系的) your personality. As part of a test at the University of Texas, Austin, USA, volunteers created a CD of their favourite songs. The volunteers then listened to each other’s CDs and made guesses about the CD creator’s personality—outgoing, adventurous, happy, and so on. These strangers correctly guessed much more about each others’ personalities through their CDs than through their clothes or taste in films. For example, Sue and Jim love punk music, which means they have outgoing personalities. The psychologists who did the test found Snoop Dogg (hip-hop) fans are likely to be energetic and talkative. People who like U2 (rock/pop music) are generally independent and adventurous. The psychologists also found that Louis Armstrong(jazz) fans tend to(倾向于) be serious and intelligent While fans of classical music are also likely to enjoy jazz music and tend to be shy.The psychologists were surprised to find that rap and heavy metal fans were also shier and quieter than many other music lovers.
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cosωt
