The double-acting variable-vane pump is a new type of variable pump.

双作用式变量叶片泵是一种新型变量泵。

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Finally, the static and dynamic test of the variable pump had been taken.

最后对系统中的变量泵进行了动静态性能试验。

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Finally, the static and dynamic test of the variable pump had been taken.

最后对系统中的变量泵进行了动静态性能试验。

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