How amazing it is! Sand turns to glass when it ___ by the lightning. A. hits B. is hit C. is hitting D. will be hit 相关知识点: 试题来源: 解析 B 【详解】 句意:这是多么神奇啊!沙子被闪电击中后变成玻璃。 考查被动语态。句子主语it指代的是“Sand”,与动词hit之间是被动关系,应用被动...
HOW IS GLASS MADE HOW IS GLASS MADE Believe it or not, glass is made from liquid sand. You can make glass by heating ordinary sand (which is mostly made of silicon dioxide) until it melts and turns into a liquid. You won't find that happening on your local beach: sand melts at ...
Turning sand into glass - even with a flux like soda ash - involves heating it up to 1,600 degrees in an enormous furnace. You fire natural gas mixed with compressed air into this cauldron and gradually, as it travels metre by metre down the furnace, the mixture of san...
Pour water into the first glass and stir. This is now no longer pure water but a mildly alkaline solution. Pour the contents of the first glass into the second and stir. Watch as the mixture changes color, because phenolphthalein is a pH indicator that turns red in alkaline solutions. Pour...
At a high level, glass is sand that’s been melted down and chemically transformed. If you’ve ever been to the beach, you know exactly how hot sand can get while remaining in its solid form. The kind of heat necessary to transform sand into a liquid state (eventually becoming glass) ...
and--finally--100 mL of vinegar in a fourth beaker. You then need to pour the contents of each beaker sequentially into the next, and observe the colors produced (so, pour the first into the second, the second into the third, and so on). While the vinegar will initially turn the sol...
百度试题 结果1 题目How is glass made?A.By hrating sand B.By masging up wood from trees C.By weaving fibres together 相关知识点: 试题来源: 解析 A
What is glass?Believe it or not, glass is made from liquid sand. You can make glass by heating ordinary sand (which is mostly made of silicon dioxide) until it melts and turns into a liquid. You won't find that happening on your local beach: sand melts at the incredibly high ...
百度试题 结果1 题目【题目】-How does the glass feel?It'sand .A. soft; smooth B. hard; roughC. hard; smooth 相关知识点: 试题来源: 解析 PB^2
Cavell also had a stable with many giant horses. He brought them from the kingdoms in the far south near the Mediterranean and east into the desserts. Some of these weren’t as large, but were so fleet of foot no other horses in the land could catch them. ...