【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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Normal
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侧垂线
③
Normal
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7.8 磅
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正平线
④
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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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
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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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false
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A与C，A点可见
④
Normal
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false
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ZH-CN
X-NONE
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A与C，C点可见
【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
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7.8 磅
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2
false
false
false
EN-US
ZH-CN
X-NONE
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A、B、C三点
②
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false
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B点
③
Normal
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B、C两点
④
Normal
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7.8 磅
0
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false
false
false
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ZH-CN
X-NONE
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C点
【单选题】
已知A、B、C三点坐标分别为（10、20、30）（20、40、60）、（30、60、90），则A、B、C三点______。
①
Normal
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false
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ZH-CN
X-NONE
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表示一个平面
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false
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不能表示一个平面
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false
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X-NONE
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表示一个特殊位置平面
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false
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无法判断
【单选题】
已知E点距H、V、W面的距离分为10、5、20; F点在E点上方5，左方10,前方15，由此可知F的坐标为（）
①
(15，30，35)
②
( 30,20,15)
③
( 15，20，30)
④
( 10,20,5)