【单选题】
已知点A(20,20,10),点B(20,25,30),则( )产生重影点。
【判断题】
人在睡觉时喜欢做梦,但不是整个睡眠过程都是在梦中度过的,做梦一般是在快速眼动睡眠阶段。
【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
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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】
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
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EN-US
ZH-CN
X-NONE
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】
用某种排序方法对线性表(25,87,21,47,15,27,63,35,20)进行排序时,元素序列的变化情况如下:(1)25,87,21,47,15,27,63,35,20(2)20,15,21,25,47,27,63,35,87(3)15,20,21,25,35,27,47,63,87(4)15,20,21,25,27,35,47,63,87则采用的排序方法是___________排序长度为4。
【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()
【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
【单选题】
某企业规定的信用条件为:“5/10,2/20,n/30”,某客户从该企业购入原价为10 000元的原材料,并于第15天付款,该客户实际支付的货款是( )。
【单选题】
某企业规定的信用条件为:“5/10,2/20,n/30”,某客户从该企业购入原价为10 000元的原材料,并于第15天付款,该客户实际支付的货款是( )。