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。
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。
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.
第四章首先测试了阀片的启动压力、阀口泄漏量、流量特性以及压力响应时间，然后对实验结果进行了分析和比较。
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