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
在下列各句的空白处填入一个适当的词,使句子意思完整,语法正确。
1.Thank you very much for________ me to your house for dinner.
2.I can't go to the movie with you tonight. I have to________ my dog.
3.Tom started learning to play the piano at the________ of 12.
4.My sister can speak two foreign ________ French and Japanese.
5.She_______ first prize in the Super Voice Girls Competition in 2009
与经纪业务相比较,自营业务在交易行为上具有非自主性。