焦油加工的主要任务是获得酚、萘、蒽等纯产品和（）等粗产品。
参考答案：洗油沥青
单项选择。
There are many . They are watching TV. [ ]
A. womans and child
B. woman and children
C. women and children
D. women and child
柴油是以十八烷值来反应柴油的自燃性好坏。（）
