【单选题】
如果空间点的位置用A(x,y,z)形式表示,那么它的V面投影的坐标应为( )。
【单选题】
点的X、Y坐标为零时,点在______上
【单选题】
如果空间点的位置用A(x,y,z)形式表示,那么它的W面投影的坐标应为( )。
【单选题】
如果空间点的位置用A(x,y,z)形式表示,那么它的H面投影的坐标应为( )。
【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】
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】
若两点C、D间的坐标增量?x为正,?y为负,则直线CD的坐标方位角位于第( )象限
【单选题】
比较z坐标的大小,可以判断两点某方向的位置关系,通常z坐标大的点在( )。
【单选题】
已知x=45,y'=a',z=0;则表达式(x>=z&&y'<z'||!y)的值是()。
【单选题】
比较y坐标的大小,可以判断两点某方向的位置关系,通常y坐标大的点在( )。
【单选题】
若A、B两点的坐标增量ΔXAB=0,ΔYAB>0,则直线AB的方位角αAB=( )。