单项选择题
A.3‰ B.4‰ C.5‰ D.8‰
A.1‰ B.2‰ C.3‰ D.4‰
A.200-250mm B.200-300mm C.200-350mm D.200-400mm
A.±50mm B.±100mm C.±150mm D.±200mm
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