Test and research on perimeter blasting result of frozen soil in mine freezing shaft;
立井冻土周边爆破效果的试验研究
The knock threshold detection is the key of gasoline engine knock detection,and it is the key of the closed loop ignition control of gasoline engines.
汽油机爆震的难点是爆震边缘点检测,爆震边缘点是汽油机点火闭环控制的前提。
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