【单选题】
下列关于重影点投影可见性的判别方法说法有误的一项是( )。
①
对正面重影点,观者从前向后看,前面一点看得见,后面一点看不见
②
对侧面重影点,观者从左向右看,左面一点看得见,右面一点看不见
③
对水平重影点,观者从上向下看,上面一点看得见,下面一点看不见
④
在投影图上判别重影点的可见性时,要求把看的见的点的投影符号用括号括起来
【单选题】
已知四点A(10、20、30)、B(30、20、10)、C(10、20、10)、D(20、20、30),则对H面的重影点为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
A与D,D点可见
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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B与C,B点可见
③
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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A与C,A点可见
④
Normal
0
7.8 磅
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2
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false
false
EN-US
ZH-CN
X-NONE
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A与C,C点可见