Up to now there has been a ____ online about whether or not life on the earth will be at an end in natural

disasters such as earthquakes and floods. [ ]

A. failure

B. focus

C. battle

D. bond

连续梁及连续刚构悬臂拼装主要危险源包括（）

A.梁段运输及吊装操作不规范，发生碰撞、伤人事故

B.悬臂吊机拼装节段梁时，吊机在走行和悬拼时发生倾覆

C.移动支架悬臂拼装节段梁时，支架发生严重变形、倾覆

D.多点顶推、集中顶推时控制手段不统一