【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
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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
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2
false
false
false
EN-US
ZH-CN
X-NONE
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mso-bidi-font-size:11.0pt;
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mso-fareast-font-family:等线;
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A与C,A点可见
④
Normal
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7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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mso-hansi-theme-font:minor-latin;
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A与C,C点可见
【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
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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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mso-para-margin:0cm;
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mso-bidi-font-size:11.0pt;
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mso-fareast-font-family:等线;
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mso-hansi-font-family:等线;
mso-hansi-theme-font:minor-latin;
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侧垂线
③
Normal
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7.8 磅
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2
false
false
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ZH-CN
X-NONE
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mso-fareast-font-family:等线;
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mso-hansi-font-family:等线;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}
正平线
④
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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mso-hansi-theme-font:minor-latin;
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铅垂线
【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
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
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表示一个平面
②
Normal
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7.8 磅
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false
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EN-US
ZH-CN
X-NONE
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不能表示一个平面
③
Normal
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7.8 磅
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false
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EN-US
ZH-CN
X-NONE
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表示一个特殊位置平面
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ZH-CN
X-NONE
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无法判断