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人教版初中物理教材第一册P.163的练习中有这样一题:图1所示的是锅炉上的保险阀.当阀门受到的蒸气压强超过安全值时,阀门被顶开,蒸气跑出一部
There is one such question in the exercises of the PEP junior middle school physics textbook P.163: Figure 1 shows the safety valve on the boiler. When the steam pressure of the valve exceeds the safe value, the valve is opened and the steam runs. One out