题目

Paula and his noodles with tomato soup Dear Allen,How’s it going? I’m in Beijing now, at Beijing International School. I’m in Class 2 with twelve other students. They’re from different countries.I’m living with a Chinese family. They are very friendly. They like to eat dumplings, noodles and rice. Now I'm very interested in cooking. Yesterday they taught me to make noodles with tomato soup—their favorite food. Now, let me tell you how to make them. First, cut up some green onions and two tomatoes. Turn on the gas cooker and heat about three teaspoons of oil in a pan. Put in the gre如图7-5-2所示a、b、c是地球大气层外圆形轨道上运动的三颗卫星，a和b质量相等且小于c的质量，则（    ） 图7-5-2A.b所需向心力最小B.b、c的周期相同且大于a的周期C.b、c的向心加速度大小相等，且大于a的向心加速度D.b、c的线速度大小相等，且小于a的线速度