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【简答题】
将物体置于三投影面体系中,利用正投影法将物体分别向三个投影面投射,即得物体的三视图,为__、俯视图和左视图。
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【单选题】That is the day_
'll never forget. A. which B. on which C. in which D. when
A.
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B.
b
C.
c
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