单项选择题
A.每月 B.3个月 C.6个月 D.12个月
A.7mm,9mm B.8mm,10mm C.10mm,11mm D.11mm,13mm
A.9mm,11mm B.12mm,15mm C.12mm,14mm D.11mm,15mm
A.3500,100 B.3000,100 C.3500,80 D.3000,80
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