A、<span style="font-size: 14px; font-family: "微软雅黑", sans-serif;">驻点一定是极值点</span>
B、<span style="font-size: 14px; font-family: "微软雅黑", sans-serif;">极值点一定是驻点</span>
C、<span style="font-size: 14px; font-family: "微软雅黑", sans-serif;">可导的极值点一定是驻点</span>
D、<span style="font-size: 14px; font-family: "微软雅黑", sans-serif;">不可导点一定不是极值点</span>