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two-ways valve 双通阀
There are some different ways of arranging porting for the four-valve diesel engine, such as two helical intake ports, two tangential intake ports or one helical port and one tangential port etc.
四气门柴油机进气道可以选用不同类型的进气道进行组合，如二个螺旋进气道、二个切向进气道或一个切向进气道一个螺旋进气道等。
Its regulation either of two ways: the curve of pipeline regulation, such as customs regulating valve;
其调节方式不外乎以下两种：管路特性曲线的调节，如关阀调节；
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