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留意观察,便可发现在一些物理教学用书、教学参考书、学生辅导用书上有一些不确切的地方,本文摘几例加以讨论,旨在引起同行的注意.一、离心式水泵的扬程不能高于10m抽水机也叫水泵,是利用大气压工作的,学生对1 atm 只能支持约10 m 高的水柱很清楚,于是学生便形成错误认识:离心式水泵的扬程不能高于10m.扬程是指水泵的提水高度,离心式水泵的扬程由上下两部分组成(见人民教育出版社物理室编的初中物理第一册第169面图11～14).下部分是吸水扬程(简称吸
Observing the observation, we can find some inaccuracies in some physics teaching books, teaching reference books, and student guidance books. This article takes several examples to discuss and aims to arouse the attention of peers. First, the centrifugal pump head cannot be high. The 10m pump, also known as a water pump, uses atmospheric pressure to work. Students can only understand that the water column at 1 atm can only support about 10 m high water, so students have a wrong understanding: the head of a centrifugal pump can’t be higher than 10m. The lift is the pump. The elevation of the pumping water, the centrifugal pump head consists of two parts (see the Physics Department of the People’s Education Press, the junior high school physics book No. 169 Figure 11 to 14). The next part is the suction head (abbreviation