单项选择题

有关均匀平面波在导电媒质中的传播特性,下列正确的是( )。 A.
传播波为TEM波,电场和磁场都在垂直于传播方向的横向平面内 B.
电场与磁场相互垂直,且电场、磁场和传播方向三者满足左手螺旋 C.
电场与磁场分量处处同相 D.
本征阻抗为实数,与媒质参数和频率有关

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听力原文: International Olympic Committee delegates praised Toronto's plans to stage the 2008 Olympics, saying that they were impressed with the oily's athlete-oriented focus.Members of the IOC's technical evaluation team, in town to review Toronto's multibillion dollar bid for the Games, offered a critique on March 11 of the city after a four-day courtship by Toronto's Olympic bid committeE.Toronto is competing against Beijing, Osaka, Istanbul and Paris for the right to host the 2008 Summer Olympic Games.Hein Verbruggen, chairman of the IOC committee, said the commission was 'impressed with Toronto's excellent sport concept. 'It sets aside reservations the IOC had made back in May about the city's plans for an Olympic park which includes 25 venues, the Olympic village, botels and a media centrE.The IOC then appeared doubtful Toronto could build an Olympic park large enough to accommodate 25 of the 28 Olympic events all within a 6 kilometre radius along Toronto's waterfront, without serious traffic congestion.After visiting Toronto the same IOC team was set to travel to Istaubual and Paris to review the remaining two cities on the five - nation short list for hosting, the 2008 Summer Games.The IOC will announce on July 13 which city has been chosen to host the 2008 Games.Which of the organizations offered a critique on March 11 of Toronto’s bid for the 2008 summer Olympic Games?A.The IOCB.The IOC executive committeE.C.The IOC's technical evaluation team.D.The IOC committeE.
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