单项选择题
已知A、B两点的海拔分别为:H=3.500m,HB=4.000m,试问AB的高差应为hab应为:()
A.-0.500m
B.+0.500m
C.+0.250m
D.-0.250m
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单项选择题
A.-0.500m
B.+0.500m
C.+0.250m
D.-0.250m
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