高压直流架空线路和地下线路分段的组合也常采用.Combinations of both overhead and under - ground HVDC line segments frequently occur.介绍一种电力机车带电通过相分段的自动转换系统.This paper introduces an automatic conversion system for locomotive pas sing through the ...
Millions were spent to hammer away at the sales resistance of voters.花费数百万元以消除选民的反感.All his recent letters hammer away at the questions of technical innovation.他最近的一些来信都一再谈到技术革新问题....