leaded gasoline是什么意思

用法例句

To analyse the key problems of free -cutting steel smelting, compare the advantages and disadvantages of four leading process, and put forward the perfect one - ladle injection leading method.

分析了冶炼含铅易切削钢的难点问题,比较了四种加铅工艺的优劣,提出了理想的加铅工艺—钢包喷呗加铅法。