三角形平面的三个投影均为缩小的类似形,该平面为
A.水平面
B.正平面
C.侧平面
D.一般位置平面
正确答案是D
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Passage 1Questions 1 to 5 are based on the following passage. The debate about the origin of Stonehenge's(英格兰巨石阵)grandest lumps of rock had been raging for at least four centuries. Now, thanks to the recovery of a chunk of the monument th