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By the 1950s, the wireless had become an established feature of every home.（）

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When we draw views of composite solids, the views of the each feature should be drawn first, and then the datum lines.（）

数控与普通数控的区别是在数控装置部分引入了一台小型通用计算机。数控与普通数控的区别是在数控装置部分引入了一台小型通用计算机。

the finish datum surfaces should always be machined at the beginning of the machining process, and then other surfaces can be machined by taking the finish datum surfaces as location datum（）

These should not be allowed to turn our attention away from the sound, established materiaThese should not be allowed to turn our attention away from the sound, established materials that form. the basis of courses for beginners.