【多选题】
对应下图表示的投影面垂直面的三面投影图，下列描述正确的有()。
①
ABCD为侧垂面
②
abcd为平面ABCD的类似形
③
θ为平面ABCD对H面的倾角
④
ρ为平面ABCD对V面的倾角
⑤
OX轴与平面ABCD平行
【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
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ZH-CN
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真实性
③
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类似收缩性
④
Normal
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ZH-CN
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收缩性