单选题
1分
In addition to lubricating, cylinder oil assists in forming a gas seal and contains _____which clean...
In addition to lubricating, cylinder oil assists in forming a gas seal and contains _____which clean the cylinder liner.
参考答案: A
参考解析: 注:除了润滑作用外,气缸油有助于形成气封,含有添加剂用来清洁缸套。