加强工程咨询服务,努力实现( ),推进资源节约型社会和环境友好型社会的建设。
A.均衡发展
B.节约发展
C.清洁发展
D.高速发展
E.安全发展
参考答案:B,C,D
You shouldn't have the machines _____all the while; you ought to have them _____now and then.[ ]
A run; repair
B. running; repairing
C. run; repaired
D. running; repaired
线路相间距离保护的I段保护范围按什么原则确定?