百度试题 结果1 题目Gunpowder is commonly known as "black gunpowder", its main components are (). A. saltpeter B. sulfur C. charcoal D. cement 相关知识点: 试题来源: 解析 A,B,C 反馈 收藏
Gunpowder, also known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur (S), charcoal (C), and potassium nitrate (saltpeter, KNO₃). The sulfur and charcoal act
Later many more gunpowder weapons will be invented, and they will eventually replace all Ancient Era weapons and completely change the way warfare is conducted. Civilopedia entry Gunpowder, also known as "black powder," was invented in China, possibly as far back as the 9th century AD, by...
IV.阅读短文,根据语篇要求填空,使短文通顺、意思完整。每空限填一词。Gunpowder is considered as one of the Four Great
Paper-making, printing techniques, gunpowder and the compass are known as ancient China's Four Great Inventions. Now China is developing very fast and some young foreigners are new technologies. They call thc Four New Great Achievements in a recent street interview. Here are some of what they ...
The reason why they did that is that all of that waste had value. It was used in the creation of saltpeter. The waste would be spread in what was known as a Nitre bed at a place called a Nitrary. Other rotting organic matter would also be used as well if it was available. ...
【解析】答案:C 核心短语/词汇 :gunpowder:火药 it is known to all that:众所周知 句子译文:众所周知,火药是一项中国发明,就像 你用来寻找方向的一种仪器,指南针一样。 解析:本题考查冠词的使用。 第一空和第二空都是 第一次提及,故都用不定冠词,A,D中有定冠词th e,排除A,D。 a用来修饰辅音发音开头...
Potassium nitrate, also known as ‘saltpetre’, or ‘saltpeter’, decomposes at high temperature to provide oxygen for the reaction. This means that gunpowder doesn’t need to be exposed to air to burn – and is why smothering fireworks won’t stop them burning! The charcoal is often represe...
B Papermaking, printing, gunpowder and the compass are known as ancient China's Four Great Inventions. Now Chin a is developing very fast and some young foreigners are amazed at some new technologies. They call them Four Great New Achievements. Here are some of what they said in a recent ...
Gunpowder, any of several low-explosive mixtures used as propelling charges in guns and as blasting agents. The first such explosive was black powder—a mixture of saltpeter (potassium nitrate), sulfur, and charcoal—which is thought to have originated i