【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
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false
EN-US
ZH-CN
X-NONE
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A与C,A点可见
④
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7.8 磅
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2
false
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EN-US
ZH-CN
X-NONE
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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
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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侧垂线
③
Normal
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false
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ZH-CN
X-NONE
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正平线
④
Normal
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7.8 磅
0
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false
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ZH-CN
X-NONE
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铅垂线
【单选题】
设一个关系模式为R(A,B,C),对应的关系内容为R={{1,10,50}, {2,10,60}, {3,20,72}, {4,30,60}},则ПB(δC70(R))的运算结果中具有的元组个数为( )。
【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
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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A、B、C三点
②
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B点
③
Normal
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ZH-CN
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B、C两点
④
Normal
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2
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false
EN-US
ZH-CN
X-NONE
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C点
【单选题】
G02X20Y20R-10F100;所加工的一般是()。
【单选题】
设物理地址(10FF0H)=10H,(10FF1H)=20H,(10FF2H)=30H,从地址10FF1H中取出一个字的内容是
【判断题】
30. 淀粉既可以作为片剂制备过程中的填充剂、崩解剂和粘合剂。
【单选题】
已知点A(20,20,10),点B(20,20,30),则( )产生重影点。