单词:direct heating type cathode
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[00:06.79]Lesson 33 1 Read and act [00:15.12]Do you think the air in Beijing is bad? [00:19.77]Yes, it's often quite dirty. [00:24.03]But don't you think it's better than it used to be? [00:28.79]Well,I can't say for sure.I've only lived here for a y
Lesson 38 Text A Can't She Type? The well-known banker, T. J. Ellington, was at one time in his younger days the manager of a New York office. His secretary had been with him for many years, and knew
Bella: What's your blood type, Luke? Luke: It's A, I think. Why do you ask? Bella: Well, mine's B. Luke: So? Bella: They say people with A blood type get along very well with those with B blood type. Luke: Really? 你是什么血型? 贝拉:卢克,
本单元是关于滴水的龙头的对话 Michal: Hey Tim, what are you doing? Tim: I'm fixing this tap. I can't put up with that drip-drip noise anymore. Michal: Have you turned off the water? Tim: I told you. That's what I'm working on. Michal: I mean the m
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Batteries of the future need to deliver more energy, and they need to be smaller. Researchers at MIT think they have developed a technology that can, a