题目

More than an eye candy Parents in Beijing are ready to go a little further to please their children now that the new China Science and Technology Museum has opened its 198-seat 4D theater. The 4D theater, which opened last month (December ), is the third cinema the museum has opened to the public since its relocation to the National Olympic Park in September. YAOX Entertainment, a Taiwan-based company producing 3D，4D，special effects and animated films, is responsible for providing the films in the coming month.      As for 3D films, audiences have to wear special goggles while watching发电机的原理是（　　）A．通电导体周围空间有磁场B．通电导体在磁场中会受到力的作用C．电磁感应现象D．同名磁极相排斥，异名磁极相吸引