总配线架使用的环境湿度是（）。
A.5-40ºc
B.0-50ºc
C.0~30ºc
D.5-30ºc
参考答案：A
An activity has an optimistic estimate of 10 days, pessimistic estimate of 16 days, most likely estimate of 13 days. Assuming a normal distribution, what is the probability that the task will be completed within 10～16 days
A．99.99%.
B．99.73 Y0.
C．95.46%.
D．68.26%.
It never ____________to me that he would be charged with murder.
A．happened
B．took place
C．occurred
D．Came
