单词：gas tetrode
单词：gas tetrode 相关文章
Airplane Engines In 1945, a new type of airplane engine was invented. It was much lighter and more powerful than earlier engines, and enabled warplanes to fly faster and higher than ever. This type of engine was called the jet engine because it below
英语专业四级考试指南
Lesson Two Pre-class Work Read the text a third time. Learn the new words and expressions listed below. Glossary alert adj. watchful and ready to meet danger birch n. 桦树 bough n. a main branch of
现代大学英语精读
我又一次陷于两头都够不上的中间境遇，作为六个孩子中的老四，很多事情对我来说不是因为年龄太小，就是太大而不合适。那天夜里就是这样。我的两个小兄弟在屋里睡觉，我的另外三个长
英语学习方法
A Coke and a SmileI know now that the man who sat with me on the old wooden stairs that hot summer night over thirty-five years ago was not a tall man. But to a five-year-old, he was a giant. We sat side by side, watching the sun go down behind the o
英语美文
17 What did people once think about lightning? [A] It was a natural phenomenon [B] It was a weapon [C] It came from the God 18What did Benjamin Franklin invent in 1752? [A] The first fishing rod [B] The first lightning rod [C] Lightning 19Which of th
听听测测