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【单选题】
我国线路作业机械化程度约为( )
A.
10%
B.
20%
C.
30%
D.
40%
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【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】对于港口装卸作业，机械化作业比重的计算公式是，机械化作业比重=（ ）×100%。
A.
机械作业工序吨/工艺过程总工序吨
B.
工艺过程工序吨/机械作业工序吨
C.
工艺过程总工序吨/机械作业工序吨
D.
机械作业工序吨之和/工艺过程总工序吨
相关题目：
【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】对于港口装卸作业，机械化作业比重的计算公式是，机械化作业比重=（ ）×100%。
A.
机械作业工序吨/工艺过程总工序吨
B.
工艺过程工序吨/机械作业工序吨
C.
工艺过程总工序吨/机械作业工序吨
D.
机械作业工序吨之和/工艺过程总工序吨
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