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【单选题】
下面关于SQL语言的叙述中,哪一条是错误的(  )
A.
SQL既可作为联机交互环境中的查询语言又可嵌入宿主语言中
B.
使用SQL用户只能定义索引而不能引用索引
C.
SQL没有数据控制功能
D.
使用SQL用户可以定义和检索视图
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举一反三
【单选题】通过对自动变速器的主油压测试,可判断多种故障产生的原因,但不能检测()
A.
起步冲击
B.
倒档拖滞
C.
换档阀的泄漏
D.
换档冲击
【单选题】Research has to focus on the cost benefit of factors such as reliability because ______.
A.
as reliability increases, manufacturing final cost may increase
B.
as reliability increases, manufacturing costs and the final cost will decrease
C.
as reliability decreases, manufacturing costs and the final cost will decrease
D.
as reliability increases, manufacturing costs and the final cost may increase
【判断题】扁形动物门的自由生活种类,如涡虫的消化系统发达,肠管分成多支,有口和肛门。( )
A.
正确
B.
错误
【单选题】Which one is true about reliability and validity?
A.
Validity is pertinent only to a particular instrument and it is an ideal state that you as a researcher to achieve.
B.
Construct validity is a less sophisticated technique for establishing the validity of an instrument.
C.
Reliability is the degree of feasibility or precision in the measurement made by a research instrument.
D.
Rationale equivalence method are not belonged to the method of reliability.
【多选题】混合是在外力的作用产生的,借助的外力一般有:( )
A.
压力
B.
机械搅拌力
C.
超声波效应
D.
拉力
【判断题】油滴的沉降速度与油滴直径有关,直径越小,沉降速度越慢。( )
A.
正确
B.
错误
【判断题】油滴的沉降速度与油滴直径有关,直径越小,沉降速度越慢。
A.
正确
B.
错误
【单选题】Which method for establishing reliability does not depend on using the measure itself?
A.
test-retest reliability
B.
split-half reliability
C.
face reliability
D.
research worker reliability
E.
conceptualization of feelings
【单选题】通过对自动变速器的主油压测试,可判断多种故障产生的原因,但不能检测( )。
A.
起步冲击
B.
倒档拖滞
C.
换挡阀的泄漏
D.
换挡冲击
【简答题】维克利经过研究对布拉德福定律提出了修正,认为布氏定律不仅局限于划分的三个区,他证明了可将等级排列的期刊划分成任意多个区得出维氏公式:T1:T2:T3:⋯:Tj=( ):( ):( ):( ):⋯:( )(b 为常数,称为维氏分布系数,Tj 为前 j 个区的杂志数量之和)。(提示:n的平方为可以表示为n^2)
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