A、<strong><span style="font-size:14px;font-family:宋体">曲线单调减少</span><span style="font-size:14px;font-family:\'Times New Roman\',\'serif\'"> </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-siz14px;font-family:宋体">曲线图形下凹（凸弧</span><span style="font-siz14px;font-family:\'Times New Roman\',\'serif\'">) </span></strong>
A、<strong><span style="font-size:14px;font-family:宋体">曲线单调减少</span><span style="font-size:14px;font-family:'Times New Roman','serif'"> </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-siz14px;font-family:宋体">曲线图形下凹（凸弧</span><span style="font-siz14px;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>
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>
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在区间 
内二阶可导， 且 
则曲线 
在 
内