单项选择题
A.0.5m B.0.5~lm C.lm D.l.2~1.5m
A.0.05% B.0.05‰ C.2% D.0.1%
A.±5mm B.±50mm C.±70mm D.±110mm
A.100mm岸 B.l50mm C.300mm D．500mm
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