【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20201022
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True or False: Metals are usually divided into two main categories: yellow metals and gray metals. ( ) Answer: × For the daily question activity in the rotating equipment section, please reply within three days. :victory: Rewards range from 5 to 15 points depending on the response; those who can provide detailed answers will receive additional rewards. All forum members are welcome to participate actively and help promote the development of the forum! ! !
Error: It should be divided into ferrous metals and non-ferrous metals
Wrong, it should be ferrous metals and non-ferrous metals
Error analysis: Correct answer: Metals are generally divided into two main categories: non-ferrous metals and ferrous metals.
Wrong; from the perspective of the national economic classification, it is classified as black and non-black metals