单项选择题
A.10cm B.20cm C.30cm D.40cm
A.600mm B.900mm C.1000mm D.1200mm
A.1~3 B.3~5 C.4~6 D.7~9
A.经纬仪 B.全站仪 C.水准仪 D.激光铅直仪
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