接地体改造或接地引下线等部件更换工作为（）检修。
A.A类
B.B类
C.C类
D.D类
参考答案：C
All these new students will be divided ________ 12 classes. Then these classes will be divided ________ the teachers.
A．to; in
B．among; into
C．into; by
D．into; among
敷设管线的管沟应用（）填实。
A.水泥
B.细沙
C.细土
D.棉纱
