【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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7.8 磅
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2
false
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EN-US
ZH-CN
X-NONE
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无法判断
【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
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7.8 磅
0
2
false
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ZH-CN
X-NONE
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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
2
false
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EN-US
ZH-CN
X-NONE
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C点
【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
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2
false
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EN-US
ZH-CN
X-NONE
A与D，D点可见
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EN-US
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B与C，B点可见
③
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A与C，A点可见
④
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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
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侧垂线
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正平线
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铅垂线
【单选题】
甲公司拥有A公司70％股权，拥有B公司30％股权，拥有C公司60％股权，A公司拥有C公司20％股权，B公司拥有C公司10％股权，则甲公司合计拥有C公司的股权为（ ）。
①
60％
②
70％
③
80％
④
90％
【单选题】
某投资公司的一项投资组合中包含A、B和C三种股票，权重分别为30%、40%和30%，三种股票的预期收益率分别为15%、12%、10%。则该投资组合的预期收益率为（ ）。
①
12.3%
②
8.9%
③
6%
④
15.3%
【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（ ）。
①
4
②
3
③
2
④
1
【单选题】
四格表中，当a=30，b=60，c=40，d=50时，最小理论频数等于（ ）
①
70×110/180
②
90×90/180
③
70×90/180
④
90×110/180