题目：
如果截平面为正垂面或侧垂面（需画出左视图）时，用（）法求实形。
A.求实长
B.变换投影面
C.直角三角形
D.旋转
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
如果截平面为正垂面或侧垂面（需画出左视图）时，用（）法求实形。 A.求实长 B.变换
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