空气喷气反作用式发动机有三种。

There are three types of airstream reaction engines.

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按阀瓣的位置不同可分为正作用式和反作用式。

Different may divide into the positive effects type and the reaction type according to the valve petal's position.

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按阀瓣的位置不同可分为正作用式和反作用式。

Different may divide into the positive effects type and the reaction type according to the valve petal's position.

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