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【单选题】
一个力的分力和其投影的关系是（ ）。A.
一个力的分力和投影都有大小和正负号，所以没有区别。
B.
一个力的分力和投影是两个不同的概念，分力是矢量，而投影是代数量。
C.
在直角坐标系中，分力和投影没有区别。
D.
只有在斜坐标系中，分力和投影才有区别。
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