单项选择题
A.直角尺 B.百格网 C.钢尺 D.经纬仪
A.1% B.2% C.3% D.5%
A.不应大于5mm B.不应小于5mm C.不应大于10mm D.不应小于10mm
A.2~4mm B.3~4mm C.4~5mm D.5~7mm
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