【判断题】
根据图所示切割体的正面投影和水平投影，其侧面投影的转向轮廓线为曲线。<img src=http://60.205.157.60/course/a@4A86563E6B6DA06893F711ACC27EA6B8.png title=4.png alt=4.png/>
①
正确
②
错误
【单选题】
当直线、平面与投影面平行时，该投影面上的投影具有( )
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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积聚性
②
Normal
0
7.8 磅
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2
false
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真实性
③
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类似收缩性
④
Normal
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收缩性