老生常谈,是指老书生或者老学究经常讲的话,说过 多少遍,似乎没有什么新意。人们听厌了这些话,往往就 轻视它或忽略它,但有时相应的问题却接踵而来,弄得不 可开交。 笔者这里要说的,是提醒读者在测量和计量工作中不 要犯两类错误的问题:第一,是量纲的错误:第二,是单 位换算的错误。 Cliche, refers to the old scholar or old school often say the words, said how many times, it seems there is nothing new. People are tired of listening to these words, often underestimate it or ignore it, but sometimes the corresponding problems have come one after another, confused. Here I want to say, is to remind the reader in the measurement and measurement work do not make two types of errors: First, the dimension of the error: Second, the unit conversion error.