In addition, inside structure of ballast water tank is very complex, shield effect to protective current also becomes a key problem in cathodic protection design.
另外压载水舱内部结构复杂，“屏蔽效应”对保护电流分布的影响也成为阴极保护设计中的关键问题。
The space structure and the whole environment is the key of the protective planning and design of the historical street area.
保护历史街区空间格局，乃至整体环境是保护规划设计的关键所在。
The space structure and the whole environment is the key of the protective planning and design of the historical street area.
保护历史街区空间格局，乃至整体环境是保护规划设计的关键所在。
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