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【单选题】
对于 k 折交叉验证 , 以下对 k 的说法正确的是 :A.
k 越大 , 不一定越好 , 选择大的 k 会加大评估时间
B.
选择更大的 k, 就会有更小的 bias ( 因为训练集更加接近总数据集 )
C.
在选择 k 时 , 要最小化数据集之间的方差
D.
所有
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反馈参考答案：
举一反三
【单选题】绘制斐波那契的第一步是什么?( )
A.
你需要选择图中的一条中线
B.
你需要选择上涨或者下跌趋势中的高点和低点
C.
你需要在中心画一垂直线
D.
你需要连接图中的四个角
【单选题】听力原文： How people first learned to invent words is unknown in other words, the origin of language is a mystery. All we really know is that people, unlike animals, somehow invented certain sounds to exp...
A.
The origin of language is a legend handed down from the past.
B.
The origin of language is a matter that is hidden or secret.
C.
The origin of language is a question difficult to answer.
D.
The origin of language is a problem not yet solved.
【单选题】下列各组离子不能用过量氨水分离的是 ( )。
A.
Pb 2+ 、Ag + ；
B.
Bi 3+ 、Zn 2+ ；
C.
Fe 3+ 、Mn 2+ ；
D.
Cu 2+ 、Cr 3+ 。
【简答题】04-61. Mr. Wells, together with all the members of his family, ____ for Europe this afternoon. (1.0分)A. A. are to leave B. B. are leaving C. C. is leaving D. D. leave
【单选题】听力原文： (32) How men first learnt to invent words is unknown, in other words, the origin of language is a mystery. All we really know is that men, unlike animals, (33) somehow invented certain sounds to...
A.
A legend handed down from the past.
B.
A matter that is hidden or secret.
C.
A question difficult to answer.
D.
A problem not yet solved.
【简答题】周日，已经六年级的小明与父母一同到公园游玩，见公园里有人设了一个游戏摊位，游客只需抛掷一枚正方体的骰子，如果出现6点，就可以获得价值10元～15元的精美动漫书籍一册，每抛掷一次骰子需要付1元，小明看到很多小朋友喜欢那些书籍，都在投掷，不禁停下了脚步在摊位前仔细观察起来，并记录了小朋友的中奖情况： 参与投掷的小朋友 投掷次数 中奖次数 1 25 2 2 28 1 3 10 0 4 20 1 5 14...
【单选题】04-61. Mr. Wells, together with all the members of his family, ____ for Europe this afternoon.
A.
are to leave
B.
are leaving
C.
is leaving
D.
leave
【单选题】听力原文： How men first learned to invent words is unknown in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express t...
A.
The origin of language is reflected in sounds and letters.
B.
The origin of language is handed down from generation to generation.
C.
The origin of language dates back to the prehistoric period.
D.
The origin of language is a problem not yet solved.
【单选题】听力原文： How men first learnt to invent words is unknown, in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express t...
A.
A legend handed down from the past.
B.
A matter that is hidden or secret.
C.
A question difficult to answer.
D.
A problem not yet solved.
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