如果原界标移动、丢失，应利用原测量数据恢复界标，然后取得有关( )人同意后埋设新界

某工厂需要横截面积为20mm²的裸铝线1000m，则购买时应称量多少kg的铝线？（ρ_铝=2.7×10³kg/m³）

共轭剪裂带上所出现的雁形“S”形张节理，是由于（）移动所导致。

通道口设防护棚，防护棚应为不小于5cm厚的木板或两道相距50cm的竹笆。

For which of the following securities is estimating the future cash flows least difficult（）

A. 5-year, 6% bond with two years of call protection.

B. 3-year note with a coupon of Libor + 100 basis points.

C. 8% preferred stock with mandatory redemption in five years.