【单选题】
已知点M坐标（10，20，10），点N坐标（10，20，0），则以下描述M、N两点相对位置关系的说法哪一种是正确的？（）
①
点M位于点N正左方
②
点M位于点N正下方
③
点M位于点N正上方
④
点M位于点N正后方
【单选题】
已知点A(20，0，0)和点B(20，0，10)，关于点A和点B的相对位置，哪一种判断是正确的? ( )
①
点B在点A前面
②
点B在点A上方，且重影于V面上
③
点A在点B下方且重影在OX轴上
④
点A在点B前面
【单选题】
已知三点A（10、20、15）、B（10、0、30）、C（0、10、0），则在坐标面上的点为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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A、B、C三点
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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B点
③
Normal
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7.8 磅
0
2
false
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ZH-CN
X-NONE
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B、C两点
④
Normal
0
7.8 磅
0
2
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false
false
EN-US
ZH-CN
X-NONE
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C点
【单选题】
己知点A (0，10, 25)和点B (0，15，25)，关于点A和点B的相对位置，哪一种判
断是正确的?
①
点A在点B前面
②
点B在点A上方，且重影于V面上
③
点A在点B 前方，
且重影在0Z轴上
④
点B在点A前面
【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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正垂线
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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侧垂线
③
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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正平线
④
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
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铅垂线
【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
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7.8 磅
0
2
false
false
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EN-US
ZH-CN
X-NONE
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A与C，A点可见
④
Normal
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2
false
false
false
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ZH-CN
X-NONE
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A与C，C点可见