模板按照形状可以分为( )。
A．木模板 B．钢模板C．平面模板 D．混凝土模板
参考答案：C
An analyst does research about convexity. Which of the following statements is mo.st accurat.e to describe positive convexity when market yields decrease（）
A. A bond experiences price increases.
B. A bond experiences diminishing price increases.
C. A bond experiences accelerating price increases.
什么叫中性点、零点和中性线、零线？
