题目

concerned him most was famers often had poor harvests and even would suffer from food shortage. 答案：【1】What【2】that我国是世界上能够发射地球同步卫星的少数国家之一，关于同步卫星，正确的说法（　　）A．可以定点在滁州市上空B．卫星轨道平面与赤道平面重合C．运动周期与地球自转周期相同的卫星肯定是同步卫星同步D．在同一轨道上有沿同方向绕行的两颗同步卫星，若要后一颗卫星追上前一颗卫星并发生碰撞，只要将后者速率增大一些即可