唐初的主要军事力量是(),它是建立在均田制基础上的,是兵农合一的制度。
参考答案:府兵
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:
系统的平均故障间隔时间为()。
A.500h
B.400h
C.300h
D.200h
—Thanks so much for everything. You have certainly made my stay very pleasant.
—________.[ ]
A. It's my duty
B. I'm with you on that
C. It's my pleasure
D. It's nice to say so