[单选题]制定营配贯通数据采录和治理工作要求，细化“（ ）”营配一体化数据模型技术标准，建立站线变户的数据采录和治理标准。
A.变电站-线路-配变-用户
B.变电站-配变-线路-用户
C.变电站-用户-线路-配变
D.变电站-线路-用户-配变

One of the most convenient and cheapest ways to see America is by riding a Greyhound bus. This interstate bus system connects all major cities in the United States, (52) people with frequent and convenient service. The bus system even has an international service (53) makes connection with cities in Canada and Mexico.
Its network even extends to some of the smaller towns and out-of-the-way communities (54) the great interior of the country. Traveling by bus may (55) longer than flying by plane, but the terminals are located in the center of most cities and there is (56) to the downtown area. These buses are comfortable and air-conditioned. They are all equipped with toilets in the rear to (57) the convenience of the passengers, but there are some very severe (58) of conduct which are strictly enforced. On all buses (59) is forbidden and the consumption of alcoholic drinks is not allowed.
(60
A. easy access
B. fast way
C. short path
D. direct approach