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
I bought my younger sister a toy with my pocket money,________that is cheap but beautiful.
A.one
B.the one
C.this
D.that
气体的标准状态是()℃、()atm。