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【单选题】
关于投影的描述,错误的是()A.
投影三要素包括：投射线、投影面和投影体
B.
投影一般分为中心投影和平行投影两类
C.
在光线的照射下，物体将在地面上投下一个影子，这个影子即是物体的投影。
D.
工程上常用投影法来绘制图样。
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