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【单选题】
关于电动锚机控制线路,下列说法正确的是______。
A.
锚机控制线路应具有电气制动和机械制动相配合的可靠制动环节，可使锚机迅速停车
B.
锚机控制线路只允许电动机堵转30 s
C.
当手柄从0位迅速扳到高速挡，锚机控制线路立即使电动机高速起动
D.
锚机控制线路控制电路，只设置短路和过载保护
参考答案：
参考解析：
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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