通过对主减速机齿轮寿命不足问题的分析，提出了在高速级采用组合式硬齿面齿轮的设计方案。
Through analyzing the problem of short life of gears in the main gearbox, the design programme for composite hard-surface gears in high-speed level is described.
组合式仪表由文丘里管和椭圆齿轮流量计组成。
The hybrid flowmeter consists of a Venturi meter and an oval gear flowmeter.
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