![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
某船发电机原动机为四冲程柴油机,其滑油化验报告显示铅元素浓度为8ppm,则铅的来源可能是__()
A.轴承
B.缸套
C.活塞环
D.活塞
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
A、轴承
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.轴承
B.缸套
C.活塞环
D.活塞
A、轴承
属于船舶发电机原动机本身故障造成全船失电的原因______。
A.相复励变压器故障
B.滑油低压
C.电气短路
D.空气开关故障
A.Ⅰ+Ⅱ+Ⅴ+Ⅵ
B.Ⅰ+Ⅳ+Ⅴ+Ⅵ
C.Ⅰ+Ⅱ+Ⅳ+Ⅵ
D.Ⅱ+Ⅲ+Ⅳ+Ⅵ
A.Ⅰ+Ⅱ+Ⅴ+Ⅵ
B.Ⅰ+Ⅳ+Ⅴ+Ⅵ
C.Ⅰ+Ⅱ+Ⅳ+Ⅵ
D.Ⅱ+Ⅲ+Ⅳ+Ⅵ