单项选择题
A.2 B.3 C.4 D.5
A.250g,19mm B.200g,20mm C.150g,18mm D.100g,30mm
A.5g/m2 B.6g/m2 C.8g/m2 D.9.5g/m2
A.150mm B.190mm C.200mm D.300mm
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