As there is less and less coal and oil, scientists are exploring new ways of making use  of ______________   energy, such as sunlight, wind and water for power and fuel.

A．abrupt

B．alternative

C．authentic

D．abstract

安装10kV杆上配电设备，作业前必须重点强调邻近带电设备及作业线路名称、起止杆塔号。邻近、交叉、跨越、平行带电线路必须交待清楚，并设专人监护。