我国古代延续了一千多年的丞相制度废除于( )
A:秦朝
B:汉朝
C:唐朝
D:明朝
—Could I get the passport in 20 days?
—________.Anyway,you shall have my answer tomorrow.
已知f(x)=lgx,x>02x,x≤0,则方程2f2(x)﹣3f(x)+1=0的解的个数为( )