【单选题】
某医院一年内收治202例腰椎间盘后突病人,其年龄的频数分布如下,为了形象表达该资料,适合选用( )年龄(岁):10~20~30~40~50~60~ 人数: 6 40 50 85 20 1
【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______。
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无法判断
【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______。
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A与D,D点可见
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B与C,B点可见
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A与C,A点可见
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A与C,C点可见
【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δB>15(R)的运算结果中具有的元组个数为( )。
【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δB15(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______。
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A、B、C三点
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B点
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B、C两点
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C点
【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】
已知点A(20,20,10),点B(20,20,30),则( )产生重影点。
【单选题】
A点坐标为(10、20、30),B点坐标为(30、20、30)则AB距离为______。
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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