3.3The following materials are widely used in high power machines except for . A: Unalloyed iron B: Nd2Fe14B permanent magnetic materials C: Aluminum-iron alloys D: Silicon-iron

The White Cliffs of Dover are composed mainly of: A: Calcium Carbonate B: Silicon Dioxide C: Mangan Oxide D: Iron Oxide

Through spectral analysis of Yangshao culture pigments, the most prominent element in the red pigment was _____. A: tin B: silicon C: copper D: iron

What is the proper order, from lower purity to higher purity, of the following types of silicon? A: Metallurgical silicon / monocrystalline silicon / polysilicon B: Monocrystalline silicon / polysilicon / metallurgical silicon C: Metallurgical silicon / polysilicon / monocrystalline silicon D: Polysilicon / metallurgical silicon / monocrystalline silicon

Many startups in Silicon Valley are branching out into new places that the trend has a name, Off Silicon Valleying__.

From Silicon Valley Index 2019, Page 6: What is the largest ethnic group in Silicon Valley, with 34% of the population?

silicon wafer的意思是____________________.

The main social services of the iron and steel industry system are the provision of iron and steel products and the consumption of iron ore A: 正确 B: 错误

What are the two social problems in Silicon Valley?

The invention of the silicon chip is a______ in the history of the computer.