答案:D
一个由5个部件组成的串联电子系统,5个部件的故障率分别为:λ1=0.0006/h,λ2=0.002/h,λ3=0.0015/h,λ4=0.0005/h,λ5=0.0004/h,则:
用元器件计数法求系统的故障率为()。
A.0.005
B.0.004
C.0.003
D.0.002
Canada is from China. [ ]
A. for
B. near
C. far