问题
选择题
水可以使燃烧的物质熄灭的原理是( )
A.降低着火点
B.隔绝空气
C.提高着火点
D.降低温度并隔绝空气
答案
灭火原理:破坏燃烧的一个条件使燃烧停止,就可以达到灭火的目的.
灭火的原理有:(1)清除可燃物或使可燃物与其他物品隔离(2)隔绝氧气或空气(3)使温度降到可燃物的着火点以下,水可以使燃烧的物质熄灭的原理是 降温和隔绝氧气,
故选D.
水可以使燃烧的物质熄灭的原理是( )
A.降低着火点
B.隔绝空气
C.提高着火点
D.降低温度并隔绝空气
灭火原理:破坏燃烧的一个条件使燃烧停止,就可以达到灭火的目的.
灭火的原理有:(1)清除可燃物或使可燃物与其他物品隔离(2)隔绝氧气或空气(3)使温度降到可燃物的着火点以下,水可以使燃烧的物质熄灭的原理是 降温和隔绝氧气,
故选D.
阅读理解。 | |
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1. Mr. Black and Mrs. Black go to see the New Year's Eve with their 10-year-old son on Monday. How much do they need to afford? A. 110 yuan. B. 130 yuan. C. 165 yuan. D. 100 yuan. 2. What movies can you see on Tuesday? A. Mural and Ice Age B. Ice Age and New Year's Eve C. New Year's Eve and Mural D. Mural, Ice Age and New Year's Eve 3. Who is the director of Ice Age? A. Chen Jiashang. B. Toby Emmerch. C. Karen Disher. D. Ciar Bravo. |