基本解释分枝性同根派生 英汉例句Keywords sodium petroleum sulfonates, enhanced oil recovery, molecular weight distribution, average molecular weight, branchiness index, aromaticity, interfacial tension; 石油磺酸钠;三次采油;分子量分布;平均当量;支化度;芳香度;界面张力;Branchi 布兰基