题目

Beijing Opera is also called Peking Opera.. It came into being after 1790 when the famous four  Anhui opera troupe(戏班) came to Beijing. Its music and singing(唱腔) came from Xipi and Er-huang in Anhui and Hubei. Its costtumes are all fascinating and artistic. It is the highest expression of the Chinese culture. It’s full of famous stories , beautiful facial paintings, and wonderful gestures and fighting. This kind of opera is very popular with Chinese people.      There are four main roles in Beijing Opera: Sheng ,Dan, Jing and Chou. Sheng is the leading male(男性) acto在研究匀变速直线运动的实验中，算出小车经过各计数点的瞬时速度，为了计算加速度，最合理的方法是? [     ]A.根据任意两计数点的速度用公式a=Δv/Δt算出加速度 B.根据实验数据画出v-t图象，量取其倾角，由公式a=tanα求出加速度 C.根据实验数据画出v-t图象，由图象上相距较远的两点所对应的速度、时间用公式a=Δv/Δt算出加速度?D.依次算出通过连续两计数点间的加速度，算出平均值作为小车的加速度