In addition, the lead free gasoline is being used in the engine, so vavle seat insert (VSI) must be made by scpecial materials.
燃料改用无铅汽油以后，阀座部分必须用特种材料制造的镶圈来补强，这种镶圈就是通常所谓的阀座圈。
Rhenium is used to make high-temperature alloys for jet engine parts and in high-octane, lead-free gasoline.
铼可以用来制造喷气式发动机的耐高温合金部件，也是高能量的无铅汽油的成分。
Rhenium is used to make high-temperature alloys for jet engine parts and in high-octane, lead-free gasoline.
铼可以用来制造喷气式发动机的耐高温合金部件，也是高能量的无铅汽油的成分。
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