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【单选题】
光缆线路的维护工作应贯彻（）的方针
A.
抢修为主、预防为辅
B.
防抢为主、预防为辅
C.
预防为主、抢修为辅
D.
预防为主、防抢结合
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers