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【简答题】
线路停电操作刀闸的顺序是怎样规定的?为什么要这样规定?
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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
【多选题】有关铂皿使用操作正确的是（）
A.
铂皿必须保持清洁光亮，以免有害物质继续与铂作用；
B.
灼烧时，铂皿不能与其他金属接触；
C.
铂皿可以直接放置于马弗炉中灼烧；
D.
灼热的铂皿不能用不锈钢坩锅钳夹取。
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
【多选题】有关铂皿使用操作正确的是（）
A.
铂皿必须保持清洁光亮，以免有害物质继续与铂作用；
B.
灼烧时，铂皿不能与其他金属接触；
C.
铂皿可以直接放置于马弗炉中灼烧；
D.
灼热的铂皿不能用不锈钢坩锅钳夹取。
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