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【简答题】
已知复数z 1 =3-4i和z 2 =4-i在复平面内所对应的向量分别为 OZ 1 ， OZ 2 （其中O为坐标原点），记向量 Z 1 Z 2 所对应的复数为z，则z的共轭复数为______．
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反馈参考答案：
举一反三
【单选题】If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed the _____.
A.
contacts are carrying excessive current
B.
contacts have become welded together
C.
shading coil is broken
D.
shading coil is loose
【单选题】竖向土方、山坡切土,开挖深度应按基础垫层底表面标高至交付施工场地标高确定,无交付施工场地标高时,应按( )标高确定。
A.
垂直地面
B.
自然地面
C.
水平地面
D.
地坪
【单选题】Motor controller or starter contacts may become welded together if the contacts _____.
A.
open too quickly and arc
B.
close under excessive pressure
C.
open or close too quickly
D.
close under excessive starting current
【单选题】Motor controller or starter contacts may become pitted and welded together if the contacts _____.
A.
open under loaded conditions
B.
close slowly with light pressure
C.
open too quickly and arc
D.
close quickly with proportionate pressure
【单选题】在党的八大上所做的发言中，陈云提出了（）的重要意见，受到重视，为大会决议所采纳。这是探索我国经济体制改革的尝试。
A.
既反保守，又反冒进
B.
给地方和企业适当下放权力
C.
“三个主体，三个补充”
【单选题】Motor starter or controller contacts may become welded together if the contacts ( )
A.
open too quickly and arc
B.
close under excessive pressure
C.
open or close too quickly
D.
close under excessive starting current
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