皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【单选题】
要改变异步电动机的旋转方向，可以通过下列哪项实现 。
A.
频率
B.
电压
C.
D.
极对数
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案：
举一反三
【单选题】偏相关分析是指在研究两个变量之间的线性相关关系时，排除其他变量的干扰之后所测量到的两个变量真正的相关系数，即偏相关分析是控制“第三者”后所获得的甲乙二者的“净”相关系数。直线相关分析是指两个变量之间是否存在直线相关关系，以及相关的方向和程度。根据上述定义，下列不属于偏相关分析的是（）
A.
在考虑身高和体重之间的相关性时，需要排除年龄变量的干扰
B.
在考虑身高和体重之间的相关性时，有必要控制南北地区变量的影响
C.
大鼠肝脏中的胆固醇含量随着微量元素锰的增加而增加
D.
估计工资收入与受教育水平之间的相关关系时，要剔除工作年限的影响
查看完整题目与答案
【单选题】EI Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the equatorial Pacific, sometimes called the Earth's heartbeat, and is a drama...
A.
which occurs in some areas other than the Pacific.
B.
whose effects direct winds to move to the poles.
C.
which human activities are chiefly responsible for.
D.
whose causes remain a mystery to human beings.
查看完整题目与答案
【简答题】数据的 1 是指数据元素及其关系在计算机存储器内的表示。 2 是逻辑结构在计算机里的实现,也称之为映像。
查看完整题目与答案
【简答题】数据的___指数据元素及其关系在计算机存储器内的表示。___是逻辑结构在计算机里的实现,也称之为映像。
查看完整题目与答案
【单选题】Could you tell me _____ the radio without any help? [     ]
A.
how did he mend
B.
what did he mend
C.
how he mend
D.
what he mend
查看完整题目与答案
【多选题】Which of the following statement is possible during Christmas?
A.
Some Austalians will ski in Perisher with Christmas hats on.
B.
Some Kiwis will go to ski in Coronet Peak, Queens Town.
C.
Some Australians in Brisbane swim in the sea and have sunbathing with Christmas hats on.
D.
Some British people will go skiing in Pennines of England.
查看完整题目与答案
【单选题】仔细阅读下列描述，并判别它是关于SDO哪个基本要素的描述？“它保存具体的数据，包括原始数据以及指向其他数据对象的引用，也包含了指向元数据的引用，这使得SDO元数据能够被读取，包括数据的类型，关系和约束等。”
A.
数据对象 Data Object
B.
数据图 Data Graph
C.
元数据 Meta Data
D.
数据中介服务 Data Mediator Service
查看完整题目与答案
【简答题】.He asked ____any elephants in the zoo the day before. A,if did you see          B,if you had seen C,whether did you see     D,that you had seen
查看完整题目与答案
【单选题】—Did Jim offer you any advice? —No, he offered _______. After listening to my problem, he said _______.
A.
none; none
B.
nothing; none
C.
none; nothing
D.
nothing; nothing
查看完整题目与答案
【单选题】El Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the equatorial Pacific, sometimes called the Earth's heartbeat, and is a drama...
A.
a description of a scene.
B.
a root cause of El Nino.
C.
a narrative of an event.
D.
a definition of EI Nino.
查看完整题目与答案
相关题目：
【单选题】偏相关分析是指在研究两个变量之间的线性相关关系时，排除其他变量的干扰之后所测量到的两个变量真正的相关系数，即偏相关分析是控制“第三者”后所获得的甲乙二者的“净”相关系数。直线相关分析是指两个变量之间是否存在直线相关关系，以及相关的方向和程度。根据上述定义，下列不属于偏相关分析的是（）
A.
在考虑身高和体重之间的相关性时，需要排除年龄变量的干扰
B.
在考虑身高和体重之间的相关性时，有必要控制南北地区变量的影响
C.
大鼠肝脏中的胆固醇含量随着微量元素锰的增加而增加
D.
估计工资收入与受教育水平之间的相关关系时，要剔除工作年限的影响
查看完整题目与答案
【单选题】EI Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the equatorial Pacific, sometimes called the Earth's heartbeat, and is a drama...
A.
which occurs in some areas other than the Pacific.
B.
whose effects direct winds to move to the poles.
C.
which human activities are chiefly responsible for.
D.
whose causes remain a mystery to human beings.
查看完整题目与答案
【简答题】数据的 1 是指数据元素及其关系在计算机存储器内的表示。 2 是逻辑结构在计算机里的实现,也称之为映像。
查看完整题目与答案
【简答题】数据的___指数据元素及其关系在计算机存储器内的表示。___是逻辑结构在计算机里的实现,也称之为映像。
查看完整题目与答案
【单选题】Could you tell me _____ the radio without any help? [     ]
A.
how did he mend
B.
what did he mend
C.
how he mend
D.
what he mend
查看完整题目与答案
【多选题】Which of the following statement is possible during Christmas?
A.
Some Austalians will ski in Perisher with Christmas hats on.
B.
Some Kiwis will go to ski in Coronet Peak, Queens Town.
C.
Some Australians in Brisbane swim in the sea and have sunbathing with Christmas hats on.
D.
Some British people will go skiing in Pennines of England.
查看完整题目与答案
【单选题】仔细阅读下列描述，并判别它是关于SDO哪个基本要素的描述？“它保存具体的数据，包括原始数据以及指向其他数据对象的引用，也包含了指向元数据的引用，这使得SDO元数据能够被读取，包括数据的类型，关系和约束等。”
A.
数据对象 Data Object
B.
数据图 Data Graph
C.
元数据 Meta Data
D.
数据中介服务 Data Mediator Service
查看完整题目与答案
【简答题】.He asked ____any elephants in the zoo the day before. A,if did you see          B,if you had seen C,whether did you see     D,that you had seen
查看完整题目与答案
【单选题】—Did Jim offer you any advice? —No, he offered _______. After listening to my problem, he said _______.
A.
none; none
B.
nothing; none
C.
none; nothing
D.
nothing; nothing
查看完整题目与答案
【单选题】El Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the equatorial Pacific, sometimes called the Earth's heartbeat, and is a drama...
A.
a description of a scene.
B.
a root cause of El Nino.
C.
a narrative of an event.
D.
a definition of EI Nino.
查看完整题目与答案
参考解析：
知识点：
题目纠错 0
发布
创建自己的小题库 - 刷刷题