人们在科学技术、商品交换以及日常生活中,都在广泛地应用等效原理(或近似等效原理)。所不同的,有的是有意识的应用,有的是无意识的应用。因为,它能将一些复杂的问题变得简单化;能用解决甲类问题的方法去解决乙类问题。由于等效原理有上述优点,因此, People apply the principle of equivalence (or equivalent equivalence) widely in science and technology, commodity exchange, and daily life. What is different is that there are conscious applications and some are unconscious applications. Because it can simplify some complicated issues; it can solve Class B problems by solving Class A problems. Since the equivalence principle has the above advantages, therefore,