单项选择题
A.15% B.20% C.25% D.30%
A.1.5mm;1.2mm B.1.2mm;1.5mm C.2.0mm;1.5mm D.1.5mm;2.0mm
A.1%;200mm;300mm;100mm B.2%;240mm;200mm;100mm C.1%;240mm;300mm;200mm D.2%;200mm;200mm;200mm
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