SolidWorks中，旋转特征可以是A、放样特征B、拉伸特征C、曲面D、薄壁特征E、实体 - 查题网

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高等继续教育 / 机械工程制图及Solidworks应用

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SolidWorks中，旋转特征可以是
A、放样特征
B、拉伸特征
C、曲面
D、薄壁特征
E、实体

积分

机械工程制图及Solidworks应用

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Man's first real invention, and one of the most important inventions in history, was the wheel. All transportation and every machine in the world depend on it. The wheel is the simplest yet perhaps the most remarkable of all inventions, because there are no wheels in nature-no living thing was ever created with wheels. How, then, did man come to invent the wheel? Perhaps some early hunters found that they could roll the carcass of a heavy animal through the forest on logs more easily than they could carry it. However, the logs themselves weighed a lot. It must have taken a great prehistoric thinker to imagine two thin slices of log connected, at their centers by a string stick. This would roll along just as the logs did, yet be much lighter and easier to handle. Thus the wheel and axle came into being and with them the first carts. (1)The wheel is important because _ _ _ _ _ _ _ .（2分）A、it was man''s first real invention B、all transportation depends on itC、every machine depends on it D、both B and C(2)The wheel is called _ _ _ _ _ _ _ .（2分）A、simpleB、complicatedC、strange D、unusual(3)It was remarkable of man to invent the wheel because _ _ _ _ _ _ _ .（2分）A、it led to many other inventionsB、man had no use for it thenC、there were no wheels in natureD、all of the above(4)The wheel was probably invented by _ _ _ _ _ _ .（2分）A、a group of early hunters B、the first men on earthC、a great prehistoric thinkerD、the man who made the first cart(5)This selection says that the first wheel may have been a _ _ _ _ _ _ .（2分）A、round piece of stone B、heavy logC、piece of metal D、slice of log新发展英语综合教程（二）

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