A. 润滑油过多 B. 润滑油过少 C. 润滑油型号不对 D. 与润滑油无关
A. 泵超压 B. 超负荷 C. 泵抽空 D. 流量增加
A. used only for pollution response B. owned and operated by the US government C. used only within a barge fleeting area D. used only on inland water
A. 正确 B. 错误