中暑体温升高属于
A．发热
B．生理性体温升高
C．病理性体温升高
D．过热
E．体温调定点上移引起的体温升高
参考答案：D
By looking at a problem in as many ways as possible, creative thinkers can findsolutions
that would _____ remain invisible(看不见的).[ ]
A. otherwise
B. yet
C. already
D. forever
设X、Y是两个方差相等的正态总体，(X1，…，XN1)、(Y1，…，YN2)分别是X、Y的样本，样本方差分别为，则统计量服从F分布，它的自由度是( )。
A．(n1-1，n2-1)
B．(n1+1，n2-1)
C．(n1-2，n2-1)
D．(n1-1，n2+1)
