什么是样本设计误差？其来源有哪些？

设二次函数f(x)=x²+bx+c(b,c∈R),已知不论α、β为何实数恒有f(sinα)≥0和f(2+cosβ)≤0。

(1)求证: b+c=－1；

(2)求证c≥3；

(3)若函数f(sinα)的最大值为8，求b，c的值.

在资格预审的评审过程中，下列关于组建资格审查委员会的构成说法正确的是（）。

A．审查委员会负责人由审查委员会成员推举产生

B．招标人的代表应具有完成相应项目资格审查的业务素质和能力，人数不得少于成员总数的2/3

C．有关技术、经济等方面的专家应当从事相关领域工作满8年并具有高级职称，人数不得少于成员总数的1/3

D．审查委员会负责人可由投标人确定

皮肉重垂胀急，深按凹陷，如烂棉不起，浅则光亮如水疱，破流黄水，浸淫皮肤的是( )

A．热肿
B．寒肿
C．风肿
D．湿肿
E．痰肿

Across a wide variety of fields, data are being collected and accumulated at a dramatic pace. There is an urgent need for a new generation of computational theories and tools to assist humans in (96) useful information (knowledge) from the rapidly growing (97) of digital data. These theories and tools are the subject of the emerging field of knowledge discovery in database (KDD). At an abstract level, the KDD field is concerned with the development of methods and techniques for making (98) of data. The basic problem addressed by the KDD process is one of mapping low-level data(which are typically too voluminous to understand and digest easily) into other forms that might be more (99) (for example, a short report), more (100) (for example, a descriptive approximation or model of the process that generated the data), or more useful (for example, a predictive model for estimating the value of future cases). At the core of the process is the application of specific data-mining methods for pattern discovery and extraction.

A．expiring

B．examining

C．extracting

D．extricating

脱轨系数（Q/P）：我国规定Q/P的评判标准（）。

A.≤0.4

B.≤0.6

C.≤0.8

D.≤1.0