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【单选题】
比较两个不同平均数的同类现象或两个性质不同的不同类现象平均数的代表性大小时,采用( )。[首经贸2007研]
A.
全距
B.
平均差
C.
标准差
D.
标准差系数
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参考答案：
举一反三
【单选题】降低电源电压调速机械特性硬度( )，调速平滑性好，损耗较小，投资较大。
A.
不变
B.
变软
C.
变硬
查看完整题目与答案
【单选题】The police __________ searching for the missing child. [     ]
A.
gave up
B.
gave in
C.
gave off
D.
gave away
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【单选题】生物膜的功能主要决定于（）
A.
膜蛋白
B.
膜脂
C.
糖类
D.
膜的结合水
E.
膜的通透性
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【单选题】降低电源电压调速机械特性硬度（ ），调速平滑性好，损耗较小，投资较大。不变
A.
变大
B.
变小
C.
不变
D.
变化
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【单选题】Why is the woman glad that the saw the man?
A.
She wants to meet his professor.
B.
She wants to ask for his advice.
C.
She enjoys talking about scientific things.
D.
She wants to thank the man.
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【简答题】A．The woman wants to explain the experiment. B．The woman wants to observe the experiment. C．The man suggests they should stay with experiment. D．The man is sorry for the insecure experiment.
查看完整题目与答案
【单选题】What disappointed us was that their determination finally ___.
A.
gave off
B.
gave out
C.
gave up
D.
gave in
查看完整题目与答案
【单选题】降低电源电压调速机械特性硬度( ),调速平滑性好,损耗较小,投资较大。
A.
变大
B.
变小
C.
不变
D.
变化
查看完整题目与答案
【单选题】What does the woman mean?
A.
She wants the man to buy it.
B.
She wants to buy it.
C.
She doesn't want to buy it.
查看完整题目与答案
【单选题】When he opened the box, it ____________ a bad smell.
A.
gave away
B.
gave in
C.
gave out
D.
gave up
查看完整题目与答案
相关题目：
【单选题】降低电源电压调速机械特性硬度( )，调速平滑性好，损耗较小，投资较大。
A.
不变
B.
变软
C.
变硬
查看完整题目与答案
【单选题】The police __________ searching for the missing child. [     ]
A.
gave up
B.
gave in
C.
gave off
D.
gave away
查看完整题目与答案
【单选题】生物膜的功能主要决定于（）
A.
膜蛋白
B.
膜脂
C.
糖类
D.
膜的结合水
E.
膜的通透性
查看完整题目与答案
【单选题】降低电源电压调速机械特性硬度（ ），调速平滑性好，损耗较小，投资较大。不变
A.
变大
B.
变小
C.
不变
D.
变化
查看完整题目与答案
【单选题】Why is the woman glad that the saw the man?
A.
She wants to meet his professor.
B.
She wants to ask for his advice.
C.
She enjoys talking about scientific things.
D.
She wants to thank the man.
查看完整题目与答案
【简答题】A．The woman wants to explain the experiment. B．The woman wants to observe the experiment. C．The man suggests they should stay with experiment. D．The man is sorry for the insecure experiment.
查看完整题目与答案
【单选题】What disappointed us was that their determination finally ___.
A.
gave off
B.
gave out
C.
gave up
D.
gave in
查看完整题目与答案
【单选题】降低电源电压调速机械特性硬度( ),调速平滑性好,损耗较小,投资较大。
A.
变大
B.
变小
C.
不变
D.
变化
查看完整题目与答案
【单选题】What does the woman mean?
A.
She wants the man to buy it.
B.
She wants to buy it.
C.
She doesn't want to buy it.
查看完整题目与答案
【单选题】When he opened the box, it ____________ a bad smell.
A.
gave away
B.
gave in
C.
gave out
D.
gave up
查看完整题目与答案
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