单项选择题
A.250mm B.500mm C.750mm D.1000mm
A.1-5mm/d B.5-10mm/d C.10-15mm/d D.15-20mm/d
A.10mm-15mm B.15mm-25mm C.25mm-30mm D.30mm-35mm
A.变化速度 B.时间 C.变化速率 D.位移
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