The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.
- Athe scavenging air
- Bthe exhaust gases
- Cthe mixed air
- Dthe spray oil
问题
The ports are drilled in the liners at
参考解析：
分类：船舶动力装置题库,海船船员考试题库
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