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19[单选题]
在弯矩发生折角处,作用有什么外力。


A.无外力

B.集中力偶矩


C.沿杆件轴线方向的集中力


D.垂直杆件轴线的集中力


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  • 1.Listen and fill in the blanks. 00:00/01:17 Ming: O.K. guys. Let’s warm up and stretch. We’ve got to work on balance and flexibility. Peter: So Ming. When did you get 1 (1) this Karate stuff? Kenji: Karate’s Japanese. Ming’s showing us Tae Kwon Do, and it’s Korean. Peter: Cool. So, what’s the 2 (2)? Ming: Tae Kwon Do uses hundreds of different 3 (3) moves. But Karate…well, Kenji, sounds like you know something about Karate. Kenji: Yeah – Karate uses more punches and 4 (4), too. Maybe you’ve seen guys break wooden boards with punches. You know, like… I learned that when I was in 5 (5). Peter: That’s great. I 6 (6) I could do that. So, Ming, why did you get into Tae Kwon Do? Ming: I had a Korean friend in 7 (7) school, and he said it could help me get in 8 (8) and build my confidence. So I tried it, and I really liked it. Peter: It looks like you succeeded. Ming: Well, I’m still working on it. I’ve really improved my 9 (9) and power. It also helps you 10 (10)—you’ll see. Peter: Awesome! Let’s get started.高级英语听说(1)