平行的两趟通信明线线路双方皆为12路载波线路,端机方向相同,增音站位置一致时,它们相互间的距离不得小于()。
A.10m
B.20m
C.30m
D.40m
参考答案:B
— You seem busy these days.
— Yes. I'm looking for a house. It's really not easy to find _____ with a garden.[ ]
A. this
B. it
C. one
D. that
焦碳在高炉冶炼中的作用是发热剂、()和料柱骨架。