下列图形中那些画斜二测时作图简单？ Which figure makes cabinet drawing simple ？
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下列图形中那些画斜二测时作图简单？ Which figure makes cabinet drawing simple ？
A．正平圆 vertical parallel circle
B．水平圆 horizontal circle
C．侧平圆角side parallel fillet
D．侧平圆 side parallel circle
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正平圆 vertical parallel circle