某资料服从正态分布,理论上在(-2.58s,+2.58s)范围内的变量值个数占全部例数的()。
A.99%
B.95%
C.68.2%
D.97.5%
E.96%
参考答案:A
Are you ________ of the mistakes you made in your final English test?
A.awared
B.unforgettable
C.awaring
D.aware
型号为129的滚动轴承的内径是<()。
A、9mm
B、145mm
C、90mm
D、100mm