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搜题
【单选题】
PNX系列铁路信号智能电源屏过压阀值的调整范围为（）。（U为输入电源的电压值）A.
0.6U～0.8U
B.
0.6U～0.9U
C.
1.1U～1.2U
D.
1.1U～1.3U
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【简答题】细菌的个体形态有哪些?
【单选题】A map is a drawing that shows where places are. It may show roads, towns, hills, and seas. It shows things as you would see them from an airplane. Some maps are big. They may take up all of a table to...
A.
strangers can use street maps to find their way in a new place
B.
one who can’t draw pictures can become a map maker.
C.
no one has ever seen the smallest map in the world
D.
on a map cities, roads, trees, grass are all of the same color
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