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【单选题】
钢铁表面锈蚀的原因.以下何者是主要的?[2000-042,2004-027]A.
钢铁本身含杂质多
B.
表面不平,经冷加工存在内应力
C.
有外部电解作用
D.
电化学作用
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举一反三
【简答题】直接插入排序和简单选择排序两种排序算法中，关键字的比较次数与初始序列无关的是（）
【单选题】The GMDSS defines four sea areas based on the ______
A.
areas in which the ship operates
B.
capacity and limitation of shore-based communication facilities
C.
position and capacity of mobile communication stations
D.
location and capacity of the facilitieis located on board ships
【单选题】The GMDSS defines( )sea areas based on the location and capability of shore based communication facilities
A.
three
B.
six
C.
five
D.
four
【单选题】The GMDSS defines four sea area based on the___
A.
location and capacity of the facilities located on board ships
B.
Position and capacity of mobile communication stations
C.
Capacity and location of shore based communication facilities
D.
Position and type of a sincre sintion
【单选题】The GMDSS defines four sea area based on the ______ .
A.
location and capacity of the facilities located on board ships
B.
Position and type of a sincere sintion
C.
Capacity and location of shore based communication facilities
D.
Position and capacity of mobile communication stations.
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