Starting with the Crux of comprehensive harnessing to troubleshoot roof leakage, measures to prolong waterproof roof lifespan which suit the national conditions were put forward.
从解决屋面渗漏综合治理的关键入手，提出了较切合国情的延长防水屋面使用年限的措施。
2
The author introduces the acid leakage of starting battery and its forming causes and proposes the preventing and maintenance measures.
介绍汽车起动用蓄电池爬酸的现象和形成机理，从使用角度分析爬酸形成原因，并提出预防和维护措施。
3
Chapter 4 first test the starting pressure of valves, leakage of valve port, flow characteristic and response time, and then the experimental results are analyzed and compared.