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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
【单选题】装运煤炭的货舱在完货后平舱的目的是( )。1防止货物移动;2均衡船舶所受货 物压力;3便于计量;4防止形成积存气体的坑洼及空气渗入煤堆。
A.
①②③④
B.
①②④
C.
①②③
D.
仅②④