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力可以沿着作用线移动而不改变它对刚体的运动效应。
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Directions：You will hear a long conversation three times, and fill the blanks with the words you'll have heard from the conversation. For blank 1, 2, 4, 5, 6 and 9, you'll fill in with the exact word, while the rest with a sentence.[音频]ConversationM:And you know, one thing that I want to ask you. It's great that you have had this experience of teaching in Indonesia and following up on what you just mentioned. What would you 1. _______ for students who do not live in an 2. _______ country and, you know, they want to learn. I don’t know about perfecting but they want at least to be able to communicate decently. How can they go about this?W: Yeah, it's really hard. That's the real struggle because, 3.________________________________________, but I really don't 4. _______ much with Dutch people and my boyfriend's English is so good that we just basically speak English all the time. So I have to make a real effort to practice. There is as much listening 5. _______ as I want --- all I have to do is turn on the TV.M:And reading also, right?W: Yeah, reading. There is plenty I can get to read and listen to, but for speaking, there really is no 6. _______ for trying to speak and use the language in a relaxed atmosphere. 7.______________________. And for that gosh, 8. ____________________________. In Sweden, they have a really cool system called Study Circles. Well, it's not... it's like a course. But really, you just have a 9. _______ leader who is there, sort of, as a coaching guide and to help out, 10. ___________________________________________.
下列各组齿轮,能正常啮合的是（）。
平行轴齿轮传动中,外啮合时两齿轮转向(__),内啮合时两齿轮转向(__)。（相同、相反）
下列关于编码与调制的说法中，正确的是？
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