Which of the following statements about duration is TRUE（）

A. The result of the formula for effective duration is for a 0.01% change in interest rates.

B. A bond’s percentage change in price and dollar change in price are both tied to the underlying price volatility.

C. The formula for effective duration is: (price when yields fall - price when yields rise)/(initial price × change in yield expressed as a decimal).

以下关于钻眼作业的规定中，正确的是（）。

A.钻眼前，应检查工作环境的安全状态

B.带支架的风架钻眼时，必须将支架安臵稳妥

C.电钻钻眼应检查把手胶套的绝缘是否良好

D.在工作面内不得拆卸，修理风钻、电钻

E.在残眼中继续钻眼要采取相应的安全措施