正确答案: A

fed from mechanical lubricators

题目：The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.

解析：A

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举一反三的答案和解析：

[单选题]凡外伤时，尤其深而小伤口及污染严重伤口均应注射______。

T.A． T(破伤风抗毒素)

[单选题]()工况不需开动锚机。

浅水抛锚

[单选题]Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?

Blocked cooling water passages to the head