油气田天然气气体深冷处理装置分馏出来的液态烃类混合物中，主要以（）为主
A、甲烷和乙烷
B、乙烷和丙烷
C、丙烷和丁烷
D、丁烷和戊烷
参考答案：C
会计要素是会计核算对象的基本分类，是设定会计报表结构和内容的依据，也是进行确认和计算的依据。会计要素主要包括资产、负债、所有者权益、收入、费用和利润等。( )
The Internet is a (66) network of networks which interconnects (67) ranging from the simplest personal computers to the most sophisticated mainframes and supercomputers. This network of networks is used for an extraordinary range of purposes - long distance collaborations, retrieving free software and documents, (68) library catalogs, (69) in t6 supercomputers - the list of current Internet activities and (70) is large and the range of possible future applications is as unlimited as our imagination.
A．service
B．servant
C．servants
D．services
