题目

                               D Even a child knows that nodding(点头) the head means “Yes”. But some people will probably be puzzled when they first come to India. When they talk to an Indian, he often shakes his head. They might think that the Indian does not like what he said, but on the contrary he is expressing agreement. The Indians have a habit of shaking their heads slightly when they talk to somebody. It doesn’t mean “No”, but “Yes”.If a person doesn’t know this, it might cause misunderstanding. At one time a foreigner in India told his 如图是位于锦江乐园的摩天轮,高度为108m,直径是98m.一质量为50kg的游客乘坐该摩天轮做匀速圆周运动旋转一圈需25min.如果以地面为零势能面,则他到达最高处时的(取g=10m/s2)(  )A.重力势能为5.4×104J,角速度为0.2rad/sB.重力势能为4.9×104J,角速度为0.2rad/sC.重力势能为5.4×104J,角速度为4.2×10-3rad/sD.重力势能为4.9×104J,角速度为4.2×10-3rad/s
英语 试题推荐