单项选择题
A.1/2 B.1/3 C.1/4 D.1/5
A.15～20mm B.15～30mm C.15～40mm D.15～50mm
A.不大于120mm B.不大于130mm C.不大于140mm D.不大于150mm
A.0.1～2mm B.0.1～3mm C.0.1～4mm D.0.1～5mm
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