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【单选题】
设有三张不同平面的方程【图片】，它们所组成的线性方程组的解的自由未知量个数为1，则这三张平面的位置关系为( ).A.
相交于一点
B.
相交于一条直线
C.
没有交点
D.
无法确定
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A.
define the problem in a way that is mutually acceptable to both sides.
B.
state the problem with an eye toward practicality and comprehensiveness.
C.
state the problem as a goal and identify the obstacles to attaining this goal.
D.
depersonalizing the problem.
E.
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