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【单选题】
桌面离地面的高度是0.9m,坐标系的原点定在桌面上,向上方向为坐标轴的正方向,有A和B两点离地面的距离分别为1.9m和0.4m。那么A和B的坐标分别为( )A.
1m, 0.5m
B.
1.9m, 0.4m
C.
1m, -0.5m
D.
0.9m, -0.5m
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