题目

At the science museum，the boys and girls get to know__________.     A．what is the spaceship like            B．what the spaceship looks like     C．how the spaceship looks 1ike         D．how does the spaceship 1ook like 答案：B11．关于磁感线和电场线，下述说法正确的是（　　）A．磁体周围的磁感线都是从磁体的北极出发，到南极终止B．磁感线和电场线都是一些互相平行的曲线C．磁感线是闭合曲线，而静电场的电场线不是闭合曲线D．磁感线和电场线都只能分别表示磁场和电场的方向