The standard throttle according to the utility model can settle the problem that the throttle of different positions and positive and negative throttle can not be replaced at root.
本 实用新型可以从根本上解决不同地点风门及正反向风门不能相互替换的难题。
The standard throttle according to the utility model can settle the problem that the throttle of different positions and positive and negative throttle can not be replaced at root.
本 实用新型可以从根本上解决不同地点风门及正反向风门不能相互替换的难题。
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