这些材料通过在所述头和所述杆之间有可能不同的制造技术结合，其中至少气门的一部分通过动磁压制成形而制成。
These materials are combined with fabrication techniques that may vary between the head and the stem, where at least a part of the valve is made by dynamic magnetic compaction.
这些材料通过在所述头和所述杆之间有可能不同的制造技术结合，其中至少气门的一部分通过动磁压制成形而制成。
These materials are combined with fabrication techniques that may vary between the head and the stem, where at least a part of the valve is made by dynamic magnetic compaction.
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