单项选择题
A.1mm B.1.5mm C.2mm D.3mm
A.Ⅱ型锂基脂 B.Ⅲ型锂基脂 C.Ⅱ号钙基润滑脂 D.Ⅲ号钙基润滑脂
A.4.5~8.5mm B.4.5~14.5mm C.6.5~8.5mm D.6.5~14.5mm
A.20mm B.30mm C.40mm D.50mm
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