在正态曲线下,小于μ-2.58σ包含的面积为()
A.0.5%
B.0.05%
C.1%
D.99%
E.99.5%
参考答案:A
The comments which he made________marketing bothered his boss greatly.[ ]
A. being concerned
B. concerned
C. be concerned
D. concerning
平面的圆周磨削采用平形砂轮,而平面的端面磨削多采用()。
A.筒形砂轮
B.园锥砂轮
C.铃形砂轮
D.异形砂轮