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【Daily Question】Utilities - Mechanical & Electrical - 20190921

2019-09-22View Original

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Electronic products have specific requirements regarding their manufacturing environment. Among these, the requirements concerning air cleanliness are based on two main indicators: the concentration of dust particles in the air and… in the air.    A. Composition of dust particles B. Proportion of dust particles C. Chemical composition of dust particles D. Particle size of dust particles Answer: D

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