There is no credible evidence the plane is in the southern Indian Ocena, where planes, boats and a mini-sub have searched in vain for weeks.
并没有强有力的证据说明飞机在南印度洋，虽然官方在该地区连续几个星期以来使用飞机，船只及潜水艇对此区域展开了密集的搜索。
Because of the different material with cylinder lid of one mini-aero engine, the hard machining process of grinding on the same plane is a key, which affects its performance.
某小型航空发动机气缸盖由于有喷钼涂层，不同材料的同一平面磨削时难加工是制约该型号发动机性能的关键工艺。
Because of the different material with cylinder lid of one mini-aero engine, the hard machining process of grinding on the same plane is a key, which affects its performance.
某小型航空发动机气缸盖由于有喷钼涂层，不同材料的同一平面磨削时难加工是制约该型号发动机性能的关键工艺。
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