knock rating

• 震率,爆击率,辛烷值,爆震率

knock rating的用法和样例：

例句

1. Another problem is that existing petrol engines cannot take advantage of the much higher octane rating.
   另外一个问题是现有的汽油引擎无法利用更高辛烷值的优势。
2. However, if it knocks heavily under most driving conditions while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage.
   可是，在使用推荐的辛烷值燃油时，要是在大部分行驶条件下爆震严重，请找你的福特授权经销商，避免任何对于发动机的损伤。