无釉细炻砖的物理性能中，吸水率平均值的技术要求为( )。
A．3%＜E≤6%
B．5%＜E≤3%
C．6%＜E≤10%
D．E＞10%
参考答案：A
In order to compute the probability of completing a project on time, the standard deviations (SD) of each activity must be known. These can be calculated using the following expression ______.
A) SD=(b-a)/6B) SD=b-a/6C) SD=(a-b)/6D) SD=(b-a)/12 Note: The definitions of a=most optimistic time and b=most pessimistic time. Use the following information for questions 10 and 11 for the following is duration data related to an activity in a time scale network.Optimistic time=a=10 daysPessimistic time=b=20 daysMost likely time=m=12 days
从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性（）
A.
B.
C.
D.
