变电站的继电保护装置（），退出等操作，须由变电站（）负责执行。
参考答案：投入；运行人员
Lucy is my mother's sister, and she is my . [ ]
A. sister
B. cousin
C. aunt
Look _____ the picture. What's this _____ English? [ ]
A. on, in
B. at, in
C. at, of
