距离保护一段的保护范围是（）。
A.该线路一半；
B.被保护线路全长；
C.被保护线路全长的80-85；
D.线路全长的20-50。
参考答案：C
She will tell us why she feels so strongly that each of us has a role _______ in making the earth a better place to live on. [ ]
A. to have played
B. to play
C. to be played
D. to be playing
某地下水的挥发酚类Ⅰ类、Ⅱ类标准值均为0.001 mg/L，若水质分析结果为0.001mg/L，应定为( )。
A．Ⅰ类
B．Ⅱ类
C．Ⅰ类或Ⅱ类
D．以上都不对
