你知道河北省从哪年起对中等职业学校农村家庭经济困难学生和涉农专业学生实行免费吗？

Not only _______ interested in football but _______ beginning to show an interest in it. [ ]

A. the teacher himself is, all his students are

B. the teacher himself is, are all his students

C. is the teacher himself, are all his students

D. is the teacher himself, all his students are

井控技术是怎样定义的？

市政设施包括（）

A.城市道路

B.城市排水设施

C.城市照明设施

D.以上市政设施的附属设施

电力系统电压控制目的是（）。

A.向用户提供合格的电能质量

B.保证电力系统安全稳定运行

C.降低电网传输损耗，提高系统运行的经济性