A、<strong><span style="font-size:14px;font-family:宋体">曲线单调减少</span></strong>
B、<strong><span style="font-size:14px;font-family:宋体">曲线单调增加</span></strong>
C、<strong><span style="font-size:14px;font-family:宋体">曲线既不增、也不减</span></strong>
D、<strong><span style="font-size:14px;font-family:宋体">曲线图形上凹</span><span style="font-size: 14px;font-family:'Times New Roman','serif'">(</span><span style="font-size:14px;font-family:宋体">凹弧</span><span style="font-size:14px;font-family:'Times New Roman','serif'">)</span></strong>
E、<strong><span style="font-size:14px;font-family:宋体">曲线图形下凹(凸弧</span><span style="font-size:14px;font-family:'Times New Roman','serif'">) </span></strong>
查看答案