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【判断题】
点估计的优良性判别标准常见的有:无偏性、相合性和有效性,A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】黄金分割点的比值,取其前三位数字的近似值是()。 (请填阿拉伯数字)
【单选题】黄金分割点是指把一条线段分割为两部分,使其中一部分与全长之比等于另一部分与这部分之比。其比值是一个无理数,用分数表示为(√5-1)/2,取其前三位数字的近似值是()。
A.
0.382
B.
3.1415926
C.
0.618
D.
0.3
【单选题】把一条线段 分割 为两部分,使其中一部分与全长之比等于另一部分与这部分之比。其比值是一个无理数,取其前三位数字的近似值是( )。 由于按此比例设计的造型十分美丽,因此称为黄金分割,也称为中外比。
A.
1.618
B.
0.618
C.
0.568
D.
0.668
【简答题】世界公认的最佳数比关系是黄金分割理论，基本含义是：两个因素的比值近似（）。
【单选题】She is good at Chinese but sometimes she is _____. [ ]
A.
careful
B.
brave
C.
careless
D.
polite
【简答题】SECTION B ENGLISH TO CHINESE Directions: Translate the following text into Chinese. It is, perhaps, no accident that many of the outstanding figures of the past were exceptionally versatile men. Right...
【单选题】Why does the author sometimes think some Chinese are impolite and inconsiderate?
A.
Because those Chinese are inclined to treat him rudely and drive him back to U. S.
B.
Because the author is an unfriendly person and he is very strict with his students.
C.
Because their relationship is teacher and student, and they are usually hostile to each other.
D.
Because they have different cultural backgrounds and have misunderstood each other.
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