题目

下列说法正确的是（ ）                                                                      A．做匀速圆周运动的物体处于平衡状态                                                  B．做匀速圆周运动的物体所受的合外力是恒力                                               C．做匀速圆周运动的物体的速度恒定                                    (2017湖南怀化) Hurry up, we’ll miss the early bus.A. but B. orC. and D. so