国外技术人员写的技术制图，值得参考，英语要好呀！

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Technical Drawing - Class Handout• A view of an object is know technically as a
projection
• A projection is a view conceived to be drawn or
projected on to a plane， known as the plane of
projection
• Multiview or orthographic projectionis a system of
views of an object formed by projectors from the
object perpendicular to the desired plane of
projection. Huh