电缆终端可以分为（）四种类型
A．户内终端
B．户外终端
C．设备终端
D．GIS终端
参考答案：A, B, C, D
B细胞特有的表面标志（）
A.CD4
B.CD8
C.CD20
D.CD3
E.CD19
We don't need to do extra work this evening. The day's work was almost ______ now.[ ]
A. at the end
B. at an end
C. at one end
D. at our end
