单项选择题
A.轴套 B.密封填料压盖 C.排量 D.润滑油系统
A.50% B.60% C.65% D.75%
A.10~15mm B.15~20mm C.20~25mm D.25~30mm
A.0.5% B.1% C.1.5% D.2.0%
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