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问题 单项选择题

当简单线性相关系数为0时，说明两个变量之间( )。

A．没有任何关系

B．不存在直线相关关系

C．不存在曲线相关关系

D．具有不确定的关系

答案

参考答案：B

解析： 简单线性相关系数是测定变量之间线性关系密切程度的量。当简单线性相关系数为0时，说明两个变量之间不存在直线相关关系，但这并不意味着两个变量之间不存在其他类型的关系，比如非线性相关关系。

单项选择题 共用题干题

Teams are required for most engineering projects. Although some small hardware or software products can be developed by individuals, the scale and complexity of modern systems is such, and the demand for short schedules so great, that it is no longer (1) for one person to do most engineering jobs. Systems development is a team (2) ,and the effectiveness of the team largely determines the (3) of the engineering. Development teams often behave much like baseball or basketball teams. Even though they may have multiple specialties, all the members work toward (4)．However, on systems maintenance and enhancement teams, the engineers often work relatively independently, much like wrestling and track teams. A team is (5) just a group of people who happen to work together. Teamwork takes practice and it involves special skills. Teams require common processes; they need agreed-upon goals; and they need effective guidance and leadership. The methods for guiding and leading such teams are well known, but they are not obvious.

空白（5）处应选择（）

A.relatively

B./

C.only

D.morethan
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单项选择题

下列对激情的说法错误的是（）

A.矫揉造作

B.具有强大的感染力

C.是创新的源动力

D.发自于内心
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